Malicious PDF — malware analysis report

Static analysis result for SHA-256 66c02da47086f4ab…

MALICIOUS

PDF

49.2 KB Created: 2020-08-14 06:12:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 527e8e762cce24f2d20ced77e7aa6799 SHA-1: 50b4e637fb0bd391630a07c7140daada9fa3de18 SHA-256: 66c02da47086f4ab2393c00351ab27a4445fd732c479e8eb707397f561d5dffc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content. The primary malicious IOC is the redirector URL, which likely leads to further malicious activity.

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.cc/pify?keyword=hollywood+horror+bluray+movies
    • http://files.jeannesternerdesigns.com/uploads/1/3/1/4/131437508/7897889.pdf
    • http://rixuzab.mccalldoylephotography.com/uploads/1/3/0/8/130814769/xedenipifir.pdf
    • http://files.graceholland.net/uploads/1/3/0/8/130874668/2933454.pdf
    • http://files.valerieraps.com/uploads/1/3/1/4/131455475/xinixubexis.pdf
    • http://files.aurorahealthservices.com/uploads/1/3/1/1/131164157/97b164c3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/2821/0073/files/how_to_hear_yourself_on_mic.pdf
    • https://cdn.shopify.com/s/files/1/0434/2172/8933/files/nuxedapanujijunitamipef.pdf
    • https://cdn.shopify.com/s/files/1/0428/2312/3100/files/83909613348.pdf
    • https://cdn.shopify.com/s/files/1/0434/6917/6992/files/sujawafojikisebevenakilas.pdf
    • https://cdn.shopify.com/s/files/1/0431/7878/6965/files/foritatoduz.pdf
    • https://cdn.shopify.com/s/files/1/0429/9217/3217/files/god_s_creation_story_with_pictures.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dusegu.pdf
    • https://cdn.shopify.com/s/files/1/0438/4607/4525/files/68483300542.pdf
    • https://cdn.shopify.com/s/files/1/0434/1461/8262/files/81939194727.pdf
    • https://cdn.shopify.com/s/files/1/0438/4233/8981/files/gonudasetabafepol.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_off00008159.bin
a146de08f8d6b5263571f54572239cfdbed259ddedf2af6ff38424cd351db42a
pdf-font-stream PDF embedded font (sfnt) at offset 0x8159 5420 bytes
font_01_sfnt_off000093b1.bin
b2d36330cae405f5b7f346715257c288237a18bfcf87eca90fc62fe9860bd546
pdf-font-stream PDF embedded font (sfnt) at offset 0x93B1 10444 bytes