Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f7d92a777c967a5…

MALICIOUS

PDF

43.2 KB Created: 2020-08-07 13:17:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9a49f38856f480d5acf35d680647897 SHA-1: 93e25f1c395eede2b9fb5ba8a1478aca0c124dd0 SHA-256: 0f7d92a777c967a5e859071928c91eb11582dc15c6675c6dacb52bd0acc14c8c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and a URL that appears to be part of a link farm or SEO spam campaign, designed to lure users to malicious 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.ru/pify?keyword=as+1594+pdf
    • http://files.anaturalselectiongsd.com/uploads/1/3/0/7/130775286/mimesiwami-lamatan-tuvimananiz.pdf
    • http://files.windowwisehereford.com/uploads/1/3/1/0/131070080/2cbeb7981.pdf
    • http://files.mkbergh.com/uploads/1/3/0/7/130775634/digiregexax-magobap.pdf
    • http://files.daytonxa.org/uploads/1/3/1/4/131452735/180acbeff4.pdf
    • http://mufonobo.workhorseexperiences.com/uploads/1/3/1/3/131380429/2257991.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/0272/4506/files/best_mods_for_stardew_valley.pdf
    • https://cdn.shopify.com/s/files/1/0428/6034/7551/files/64831146719.pdf
    • https://cdn.shopify.com/s/files/1/0431/4529/8074/files/gugomibebusa.pdf
    • https://cdn.shopify.com/s/files/1/0440/8446/1720/files/fadifixibe.pdf
    • https://cdn.shopify.com/s/files/1/0434/6275/4461/files/rock_pi_4b.pdf
    • https://cdn.shopify.com/s/files/1/0430/0364/2007/files/gti_dsg_vs_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/3606/5438/files/sopilerovejolizamag.pdf
    • https://cdn.shopify.com/s/files/1/0435/4211/8555/files/transparent_background_code.pdf
    • https://cdn.shopify.com/s/files/1/0428/1470/1735/files/41929008675.pdf
    • https://cdn.shopify.com/s/files/1/0437/8460/1752/files/87922405416.pdf
    • https://cdn.shopify.com/s/files/1/0432/2285/9944/files/59736573752.pdf
    • https://cdn.shopify.com/s/files/1/0440/8508/4310/files/vijofexojad.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_off0000527a.bin
6666e306ec8ef847fbfe41add0fde5745741fcb654487033fc39e404de2eae66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x527A 4432 bytes
font_01_sfnt_off00006183.bin
03b4f7d5103b0a5ac26756b7318859a38e9a5f419ea6f581704f5d927f441306		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6183 15164 bytes
font_02_sfnt_off0000901e.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x901E 4324 bytes

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