Malicious PDF — malware analysis report

Static analysis result for SHA-256 68a5e348c722432c…

MALICIOUS

PDF

43.9 KB Created: 2020-08-14 00:40:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b12156725f5412e771f6ee5ea770506 SHA-1: 4c24a927606079b6b4c7a7a5bcc6da56aebe3cd4 SHA-256: 68a5e348c722432cf2c0ec1fbca5bba60d34fc0b5b0485140d72e1db92de840d
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, including a critical link to a known malicious redirector at `https://ttraff.ru/pify?keyword=resume+letter+format+for+teacher`. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure users to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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=resume+letter+format+for+teacher
    • http://begika.validage.net/uploads/1/3/1/0/131070420/dotojonirawozis_bivobodalafil_xazotim_nasevepafogo.pdf
    • http://files.vbashelbyville.com/uploads/1/3/0/7/130776276/nesifepoz.pdf
    • http://files.livingvoice.ca/uploads/1/3/0/9/130968984/varagolo_taditafujaleva.pdf
    • http://vugab.abruckx.com/uploads/1/3/2/3/132303189/terumid.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4046/4281/files/amphotericin_b_package_insert.pdf
    • https://cdn.shopify.com/s/files/1/0430/6924/3549/files/15880856112.pdf
    • https://cdn.shopify.com/s/files/1/0431/9186/1410/files/gupanaxikiliwodonuvagew.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/28650507632.pdf
    • https://cdn.shopify.com/s/files/1/0434/6131/2676/files/38156364561.pdf
    • https://cdn.shopify.com/s/files/1/0437/2060/5848/files/10542793227.pdf
    • https://cdn.shopify.com/s/files/1/0430/2071/4137/files/centos_build_essential.pdf
    • https://cdn.shopify.com/s/files/1/0431/0489/5143/files/31781244592.pdf
    • https://cdn.shopify.com/s/files/1/0428/4933/7507/files/xoxotadosixevizifo.pdf
    • https://cdn.shopify.com/s/files/1/0433/4249/5895/files/72553961289.pdf
    • https://cdn.shopify.com/s/files/1/0433/9492/4694/files/53075375176.pdf
    • https://cdn.shopify.com/s/files/1/0427/6623/7852/files/47971801261.pdf
    • https://cdn.shopify.com/s/files/1/0434/2710/2887/files/affidavit_of_loss_atm_card.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_off00006e2d.bin
5d125adec263bb4b26c41854b831cb362eb89b7166f2fe22b646f8abac69b62c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E2D 5128 bytes
font_01_sfnt_off00007f76.bin
3b0fa8102a6bbae6c81a1b133a7d10c38fa5feed0ac50d81cca0fbad2a910957		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F76 10408 bytes

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