Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fc444ef939b08a0…

MALICIOUS

PDF

42.0 KB Created: 2020-08-12 13:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e646ddf86ae9f8c9fe45225758d049e SHA-1: 2703d0c7895784f64e53178def3fe067134e12ca SHA-256: 0fc444ef939b08a02857bfec029028f15f74ad4095c0b5854ba1db11afb4e9ee
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to external PDF files hosted on various domains, including a known malicious redirector. This suggests a link farm or redirection scheme designed to lead users to malicious content. The ML classifier also strongly indicated maliciousness.

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.ru/pify?keyword=adagio+de+albinoni+pdf
    • http://files.jenniphelanphotography.com/uploads/1/3/0/8/130874489/3822705.pdf
    • http://files.leahatwood.com/uploads/1/3/0/7/130739284/wefajigunivigefu.pdf
    • http://files.visitdvcc.org/uploads/1/3/0/7/130740068/zemida-wupalusitez.pdf
    • http://binowi.lifelongfitnesspersonaltraining.com/uploads/1/3/1/4/131438142/50e8f7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8893/7120/files/39610270317.pdf
    • https://cdn.shopify.com/s/files/1/0435/6544/9365/files/12288650474.pdf
    • https://cdn.shopify.com/s/files/1/0431/0712/3357/files/book_review_definition.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/85986419962.pdf
    • https://cdn.shopify.com/s/files/1/0433/2145/8853/files/construction_of_biogas_plant.pdf
    • https://cdn.shopify.com/s/files/1/0429/3266/6524/files/33125133317.pdf
    • https://cdn.shopify.com/s/files/1/0428/7214/4038/files/38481920453.pdf
    • https://cdn.shopify.com/s/files/1/0432/1912/4382/files/dajukewawuwidegutap.pdf
    • https://cdn.shopify.com/s/files/1/0429/9217/3217/files/33058014048.pdf
    • https://cdn.shopify.com/s/files/1/0431/2281/9233/files/kaplan_step_2.pdf
    • https://cdn.shopify.com/s/files/1/0429/0517/4183/files/fiwajoponetuvupuzu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3262/4808/files/dadogesadafiruxaragap.pdf
    • https://cdn.shopify.com/s/files/1/0427/4287/4278/files/2297729476.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_off0000677b.bin
b1ab248e2377d0ff0d42fcc9875e2212ab005b75551dc816ea00e092cedb18aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x677B 5064 bytes
font_01_sfnt_off000078c8.bin
87d1583fa94191c73cfb88c3023e0e3ff6f5d9e1871b57d7ba62aa04634d575e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78C8 10080 bytes

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