Malicious PDF — malware analysis report

Static analysis result for SHA-256 af760034e9415c0c…

MALICIOUS

PDF

112.6 KB Created: 2020-08-26 00:17:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 54c1aa7716e779ff98bf3093b93b5065 SHA-1: 6a199345244c13f3273eb6ba6da50f5862147223 SHA-256: af760034e9415c0cc6ec983ae06c6e6cb97855ae3a7de34c863e21cf25342e83
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link that redirects to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the text 'Lei de difamacion em venezuela o' and the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier also strongly flagged this PDF as malicious.

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.me/pify?keyword=lei+de+difamacion+em+venezuela+o In PDF document text
    • http://xuxur.reikibyleslie.com/uploads/1/3/1/1/131164250/sudewipewasepit.pdfIn PDF document text
    • http://fipoluba.wattleandoak.com.au/uploads/1/3/0/8/130874493/wojap-remukumuzekaja-gogof.pdfIn PDF document text
    • http://larogu.nilakim.com/uploads/1/3/1/4/131407406/ca91fefec7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6663/0050/files/dnd_5e_incapacitated.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4197/9553/files/hiatus_hernia_guidelines.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8660/1635/files/fafixiveliloxazedatisuxat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6534/3133/files/44674434107.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0452/7433/3346/files/augmentation_of_labor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0392/6952/files/callaway_hot_x2_driver_adjustments.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3318/9800/files/tidikozodovabut.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1610/1793/files/keludaduvabizijekaporuxi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/2583/1835/files/all_beautiful_song_soundtrack.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9832/4638/files/chemical_bonding_practice_questions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5004/8420/files/93808861558.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_off00017ca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CA2 4944 bytes
SHA-256: 3f9b2c07e90e16fa514528bddb7d5826985af7c54f7c8a9cd7448ceb3e6b2fb8
font_01_sfnt_off00018d75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D75 12692 bytes
SHA-256: 2a8904613e35258baea00fb8807e41425584f9785596d601bc8febac43c9fec0

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