Malicious PDF — malware analysis report

Static analysis result for SHA-256 935bd95f478796f7…

MALICIOUS

PDF

35.3 KB Created: 2020-07-10 00:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: f01683d1033db271e697271f8a16e7f4 SHA-1: 752a1ac0de71e0c8776c203eb80ee6e10fc504f4 SHA-256: 935bd95f478796f7492455582d2b38cc755af5da701c247ecca9b5e0d38f7cf2
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of embedded links, many of which point to domains associated with link farms and redirectors. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a link to ttraff.cc, a known malicious redirector. The document body, though partially obfuscated, also contains the same URLs, reinforcing the intent to direct users to potentially harmful external sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/wb?keyword=financial%20accounting%20and%20reporting%201%20by%20valix%20pdf In PDF document text
    • http://files.valleyharvestmarathon.ca/uploads/1/3/1/4/131407665/d94f427ef63b22.pdfIn PDF document text
    • http://files.ambleon.net/uploads/1/3/1/0/131070125/zulalusimutolosu.pdfIn PDF document text
    • http://files.rag.org.uk/uploads/1/3/1/1/131163853/2666429.pdfIn PDF document text
    • http://files.denverplacentaencapsulation.balancedbirthservices.com/uploads/1/3/1/4/131437210/xapodesen.pdfIn PDF document text
    • http://files.greendoornorway.com/uploads/1/3/1/3/131378816/6930806.pdfIn PDF document text
    • http://files.charlottesvilledivorceattorney.com/uploads/1/3/0/7/130776408/fejazugajozafo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://vedededegi.files.wordpress.com/2020/07/karogebavakegabikomekuxa.pdfIn PDF document text
    • https://josejoxoboko.files.wordpress.com/2020/06/guvijasisipum.pdfIn PDF document text
    • https://molozujepaxu.files.wordpress.com/2020/07/jotovesi.pdfIn PDF document text
    • https://nunolug.files.wordpress.com/2020/07/neropofigoweweniv.pdfIn PDF document text
    • https://pibukoridap.files.wordpress.com/2020/07/laduvuronob.pdfIn PDF document text
    • https://fedidew.files.wordpress.com/2020/06/15883119079.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/datofugilasififuko.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bopeberovejaxurid.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/romiket.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fofigez.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fiwowosilikaragufes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xuwuvedalolavotidexetugom.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004c48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4C48 5404 bytes
SHA-256: 1da5aa38d5ab59aaea31efc7295e6aaacdca660aeabea69547e485e5291adc15
font_01_sfnt_off00005eb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EB7 9656 bytes
SHA-256: b2f55c88e556f7c598aff8fbe895aed45bbb7af7861506d18ae72d9a81d5a079

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