Malicious PDF — malware analysis report

Static analysis result for SHA-256 647a529b0d1e4363…

MALICIOUS

PDF

40.4 KB Created: 2020-08-21 03:40:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b53f18261ce16f6bcf941b98893ecdc0 SHA-1: 9b844c0a1d8684b7647f44826726e6025f9bb426 SHA-256: 647a529b0d1e4363a4a9d74cbbbd65414d1ce7f699c4835392afcd6ab489378b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with the primary URL identified as a malicious redirector. This suggests the document is designed to direct users to potentially harmful websites, possibly for phishing or distributing further malware. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.ru/pify?keyword=causative+form+multiple+choice+exercises
    • http://files.diggingupyourrootsbyashley.com/uploads/1/3/1/3/131380008/vodunuvo.pdf
    • http://files.jeehanquijano.com/uploads/1/3/2/6/132695397/010c3462a5.pdf
    • http://files.dpnutritionandfitness.com/uploads/1/3/0/8/130873877/36f40362c984cd.pdf
    • http://files.acctngmatters.com/uploads/1/3/1/8/131856627/5f5a8.pdf
    • http://dasot.imagebunny.com/uploads/1/3/0/7/130738970/tanarojifiwovo_fudedu.pdf
    • http://urluss.com/10tlpy
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/2807/7992/files/58350701450.pdf
    • https://cdn.shopify.com/s/files/1/0428/5313/8588/files/fupewixugus.pdf
    • https://cdn.shopify.com/s/files/1/0429/6658/1407/files/fishing_report_orange_beach_alabama.pdf
    • https://cdn.shopify.com/s/files/1/0433/1939/4462/files/rakitadopup.pdf
    • https://cdn.shopify.com/s/files/1/0432/8167/8494/files/68617274947.pdf
    • https://cdn.shopify.com/s/files/1/0432/8852/7006/files/twilight_eclipse_book.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vatamukizulenekop.pdf
    • https://cdn.shopify.com/s/files/1/0428/3901/5580/files/gatabebabepo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9371/2286/files/vepawivozimudatowazos.pdf
    • https://cdn.shopify.com/s/files/1/0430/0088/9507/files/pifata.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060c7.bin
ba9bdde8e1ba7a3dc52fb18b6c4556984ce4566fcb00b76c9bfcb553a48974de
pdf-font-stream PDF embedded font (sfnt) at offset 0x60C7 5288 bytes
font_01_sfnt_off000072a7.bin
31fff6288012b14541aed832e5971a7583234835f835ba319a9fb377a21b63c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x72A7 10008 bytes