Malicious PDF — malware analysis report

Static analysis result for SHA-256 73bc0f97a797aca8…

MALICIOUS

PDF

36.7 KB Created: 2020-08-14 20:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15149c3c31ede3c8e705ee1527421ff8 SHA-1: 6301f1a4eef0e4cd59d20b0f3617a5758568b2af SHA-256: 73bc0f97a797aca80bf8554c305cf1e518da80dde387a53e1e109b8b6a84625c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to Shopify domains, but one critical link redirects to `ttraff.com`, a known malicious redirector. The document body, though heavily obfuscated, contains the same suspicious URL. This suggests the PDF is part of a link farm designed to drive traffic to malicious sites, likely for phishing or malware distribution.

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.com/wb?keyword=3.1%20sequences%20of%20transformations%20worksheet
    • http://zelesu.maxfloguttering.com/uploads/1/3/0/9/130969724/gigemowuvukabux.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/7872/9374/files/takozodukolajisoxaj.pdf
    • https://cdn.shopify.com/s/files/1/0434/5200/6552/files/28013509099.pdf
    • https://cdn.shopify.com/s/files/1/0433/4111/9647/files/89109185290.pdf
    • https://cdn.shopify.com/s/files/1/0427/7813/2636/files/47951162907.pdf
    • https://cdn.shopify.com/s/files/1/0436/9947/0490/files/danojonexetik.pdf
    • https://cdn.shopify.com/s/files/1/0433/4845/9675/files/39660133706.pdf
    • https://cdn.shopify.com/s/files/1/0437/7319/8487/files/25038060522.pdf
    • https://cdn.shopify.com/s/files/1/0433/2729/1544/files/xowibin.pdf
    • https://cdn.shopify.com/s/files/1/0428/5769/3347/files/50065828579.pdf
    • https://cdn.shopify.com/s/files/1/0428/0087/3631/files/53905214782.pdf
    • https://cdn.shopify.com/s/files/1/0431/6990/6852/files/78145238654.pdf
    • https://cdn.shopify.com/s/files/1/0433/9902/0696/files/prepatellar_bursitis_nhs.pdf
    • https://cdn.shopify.com/s/files/1/0435/5584/8355/files/41849162391.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_off0000502b.bin
e5bc17dd85c63f71905456d7a19b07010596b69edb1af399ca955497a5e9108b
pdf-font-stream PDF embedded font (sfnt) at offset 0x502B 5524 bytes
font_01_sfnt_off000062e4.bin
69dcad9da54d3c1799c2d812c9e1db993e2798c8264387481536c8c30737a3c8
pdf-font-stream PDF embedded font (sfnt) at offset 0x62E4 10396 bytes