Malicious PDF — malware analysis report

Static analysis result for SHA-256 4612b104bdf3bfd3…

MALICIOUS

PDF

49.2 KB Created: 2020-08-20 14:28:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: de8e92448a66944b163076c0fd917d5f SHA-1: 35b2a775be5fbfad23c6481ba723350e68ac52c5 SHA-256: 4612b104bdf3bfd3dd958857d56677c587425dcf7630293a9eba866232004930
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The document body contains numerous URLs, with a prominent one being `https://ttraff.com/pify?keyword=unikey+4.+02+rc`, which is associated with known malicious redirector infrastructure. The presence of a large number of external links suggests an attempt to lead users to potentially harmful sites.

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=unikey+4.+02+rc In PDF document text
    • http://xekokones.lisaraephotography.net/uploads/1/3/2/7/132740900/5291383.pdfIn PDF document text
    • http://negagu.genpromotion.nl/uploads/1/3/0/7/130740117/600100221f.pdfIn PDF document text
    • http://porat.taseelcommons.com/uploads/1/3/1/8/131871721/kenitevamepu-dukawisipozoz-nemigumarok.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6181/4172/files/95319764588.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/7300/9819/files/wiguj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5511/9512/files/90501149080.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0454/7146/5624/files/rugofe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9266/3702/files/3080078814.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8346/3832/files/39654920253.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7829/5450/files/73817942961.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2940/5600/files/biosynthesis_of_catecholamines.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9382/6463/files/52104058896.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000625d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x625D 4524 bytes
SHA-256: 7df5aaa644adea65849bc8c37b7d34fdda5f2755e8218f5cee4dedd0f131af0e
font_01_sfnt_off000071ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71CE 10128 bytes
SHA-256: d91bde9b3b80f24d45a24969e4e9bb171a04706408eb59c153a63cb5c87ecc06
font_02_sfnt_off000094c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94C1 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e
font_03_sfnt_off0000a9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA9F1 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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