Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c0ae83a44fb2814…

MALICIOUS

PDF

66.6 KB Created: 2020-08-26 07:41:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a3662adde7356154640cd18175bc3c5 SHA-1: fbe3ef17a60a52375fe6b48629a5b85e9dd2613f SHA-256: 4c0ae83a44fb2814b8cc26ecde658d30d08b0faf9e4bd4ad6ae90a5e4dd18899
152 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 a redirector service (ttraff.com) known for malicious activity. The document body, though partially obfuscated, also contains the same redirector URL and a list of other URLs hosted on various domains, suggesting a link farm or redirection scheme. The ML classifier also flagged this PDF as malicious. The primary attack pattern involves luring users to malicious sites through deceptive links.

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.com/pify?keyword=formal+language+and+automata+theory
    • http://files.diaparker.com/uploads/1/3/1/3/131380934/buxegepef.pdf
    • http://jimorusox.nativeamericanfluteshop.com/uploads/1/3/1/6/131636725/b25362421cd.pdf
    • http://paposo.manafazzam.com/uploads/1/3/2/6/132695569/lotamo_lafufatume_narisunamajiwuk_gifujomasax.pdf
    • http://basetig.cliftontaxiservice.com/uploads/1/3/0/7/130740073/perenudemisanu.pdf
    • https://cdn.shopify.com/s/files/1/0435/5575/0049/files/bacaan_sholat_latin.pdf
    • https://cdn.shopify.com/s/files/1/0431/0191/3244/files/jipufoludiwow.pdf
    • https://cdn.shopify.com/s/files/1/0429/6255/0940/files/el_nacionalismo_mexicano.pdf
    • https://cdn.shopify.com/s/files/1/0443/3159/7980/files/92468222356.pdf
    • https://cdn.shopify.com/s/files/1/0430/0367/4785/files/bonaventure_cemetery_map.pdf
    • https://cdn.shopify.com/s/files/1/0430/6622/8898/files/abhimaan_2016_full_movie_720p.pdf
    • https://cdn.shopify.com/s/files/1/0433/7270/7990/files/albuterol_sulfate_davis.pdf
    • https://cdn.shopify.com/s/files/1/0450/2913/0404/files/convert_amazon_kindle_to_online.pdf
    • https://cdn.shopify.com/s/files/1/0434/2988/8161/files/isolating_variables_worksheet_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0438/9833/9496/files/catalogo_aspiratori_vortice.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a4da.bin
cc69a912b2bb33cc27e964176df75a2cb8fca718ed64a3c8aeb362389125132f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA4DA 5120 bytes
font_01_sfnt_off0000b617.bin
121ff291dfad33a76264cb38bcd0339c7064abe8d0c5a859e341d9170ea8ca8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB617 14700 bytes
font_02_sfnt_off0000e580.bin
f4445675e2c89afe3cd2c802c853a5e66178d30efde5716812733793d3b253b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE580 16364 bytes

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