Malicious PDF — malware analysis report

Static analysis result for SHA-256 19500f6169fc3746…

MALICIOUS

PDF

46.0 KB Created: 2020-08-28 02:20:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1c4eeaea291783742cffb788f350c72 SHA-1: f1ca752930463e8aca56054e44d72035a0b84b55 SHA-256: 19500f6169fc3746a4bd61cc112683b5608f0a2122a2dd06bbb37736d905fbda
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the URL that triggers the malicious redirector. This suggests a phishing or scam attempt designed to lead users to malicious content.

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.cc/pify?keyword=the+lion+sleeps+tonight+notes
    • http://files.myfutra.com/uploads/1/3/1/3/131384018/netax.pdf
    • http://lewafozur.synthesisaestheticsproject.org/uploads/1/3/1/8/131856602/a6a134b6f4298e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/7278/2489/files/navanumififezivaviv.pdf
    • https://cdn.shopify.com/s/files/1/0440/9825/7048/files/10284266374.pdf
    • https://cdn.shopify.com/s/files/1/0437/6982/3390/files/biology_terms_and_definitions_for_high_school.pdf
    • https://cdn.shopify.com/s/files/1/0431/2770/1665/files/79051045529.pdf
    • https://cdn.shopify.com/s/files/1/0431/5286/7494/files/tosobapototigokalin.pdf
    • https://cdn.shopify.com/s/files/1/0440/3757/0710/files/mavasisoloxud.pdf
    • https://cdn.shopify.com/s/files/1/0440/5261/1222/files/18940904894.pdf
    • https://cdn.shopify.com/s/files/1/0428/8207/2732/files/amputations_review.pdf
    • https://cdn.shopify.com/s/files/1/0430/0413/3525/files/47713306387.pdf
    • https://cdn.shopify.com/s/files/1/0431/3654/9018/files/48302506348.pdf
    • https://cdn.shopify.com/s/files/1/0432/1142/3902/files/vozuxegelojimidevikadeve.pdf
    • https://cdn.shopify.com/s/files/1/0434/6707/9830/files/da_form_4610_r.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/66447206136.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_off0000751c.bin
4f4b0d71920f41b0b7a78d438d0b9decd29c00f9b2a24dffd9d204843b366dbd
pdf-font-stream PDF embedded font (sfnt) at offset 0x751C 4724 bytes
font_01_sfnt_off00008531.bin
172e83e1f9f80a70efb39a7e96182c9fa6b4354f0907d042f13feb8af72d1ee5
pdf-font-stream PDF embedded font (sfnt) at offset 0x8531 11080 bytes