Malicious PDF — malware analysis report

Static analysis result for SHA-256 15090bdbbfc9cb7c…

MALICIOUS

PDF

46.4 KB Created: 2020-08-27 17:56:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a9c57eca785c08b4d1fe95dff170f8d SHA-1: dd6f4b3dd0f9eea81511e88b352e69eb68dc447c SHA-256: 15090bdbbfc9cb7ce758895833d42d8f22d680c4f4f9c56437f4eae3a3902d14
194 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which are algorithmically generated and point to potentially malicious domains. One critical heuristic identified a link to a known malicious redirector infrastructure, suggesting an attempt to funnel users to malicious content. The document body, though partially garbled, contains a URL that appears to be the primary lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=ya%25C5%259Fam+d%25C3%25B6ng%25C3%25BCs%25C3%25BC+nedir
    • http://damutuv.piconservation.org/uploads/1/3/1/1/131164250/9fc6de65d.pdf
    • http://files.reflexologytampabay.com/uploads/1/3/1/0/131071277/8602fa.pdf
    • http://mutovuj.salinaslightpainterphotography.com/uploads/1/3/2/6/132681237/rofexanekurozewel.pdf
    • http://vagevabi.vineyardranchpta.org/uploads/1/3/2/6/132682659/8373714.pdf
    • http://vinix.littlefeetchildcarecenterkatonahny.com/uploads/1/3/0/8/130813755/9136833.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/0346/9221/files/573039036.pdf
    • https://cdn.shopify.com/s/files/1/0437/8958/2487/files/secured_won_t_print.pdf
    • https://cdn.shopify.com/s/files/1/0462/0615/6953/files/16209951983.pdf
    • https://cdn.shopify.com/s/files/1/0434/7248/6564/files/13124370278.pdf
    • https://cdn.shopify.com/s/files/1/0428/5464/5916/files/suzuki_lt_z250.pdf
    • https://cdn.shopify.com/s/files/1/0438/8637/9163/files/2nd_edition_player_s_handbook.pdf
    • https://cdn.shopify.com/s/files/1/0431/8704/4515/files/65610217393.pdf
    • https://cdn.shopify.com/s/files/1/0461/4186/6137/files/6s_iphone_reviews.pdf
    • https://cdn.shopify.com/s/files/1/0438/3762/0386/files/80977798187.pdf
    • https://cdn.shopify.com/s/files/1/0433/6710/4664/files/burma_tv_9._06.pdf
    • https://cdn.shopify.com/s/files/1/0434/7786/0516/files/kexepepuxegawan.pdf
    • https://cdn.shopify.com/s/files/1/0428/9645/7884/files/fagazewatalofarivamase.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000666c.bin
e2482b77beb4d7f23c2eb2d075c34dbd989a643dba4f13d10da6ed836a7e3f5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x666C 5176 bytes
font_01_sfnt_off0000775b.bin
5f0bcf624a585e016dd8c2204212deb4edffbcd19f15a610c650b82f086c7403		 pdf-font-stream PDF embedded font (sfnt) at offset 0x775B 11952 bytes
font_02_sfnt_off00009ce1.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CE1 4324 bytes

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