Malicious PDF — malware analysis report

Static analysis result for SHA-256 04b9a26d925195ee…

MALICIOUS

PDF

41.9 KB Created: 2020-08-11 17:36:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9856dfc5f67d00e814b6950f223e90f SHA-1: 3b6842d822f6602eb128397e8eeb79a49ae3e3b5 SHA-256: 04b9a26d925195ee00439d2e2868fbfaaa97744cc2ce5a45dcecca237f53dca9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged as malicious due to a high number of embedded links, many of which point to known redirector infrastructure or appear to be part of an SEO link farm. The primary malicious URL identified is https://ttraff.com/pify?keyword=%25C4%258De%25C5%25A1tina+pro+cizince+c1+pdf. While no scripts were extracted, the sheer volume of links suggests an attempt to manipulate search engine rankings or distribute 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.com/pify?keyword=%25C4%258De%25C5%25A1tina+pro+cizince+c1+pdf
    • http://files.westfieldboyssoccer.com/uploads/1/3/2/6/132695749/fufurux.pdf
    • http://files.mountainestatestea.com/uploads/1/3/0/7/130738917/durut.pdf
    • http://fadatijo.jarryjornopublishing.com/uploads/1/3/1/4/131437987/0a431583c7.pdf
    • http://files.wilsonhypnotherapy.com/uploads/1/3/1/0/131070230/76bde89cc2c9e.pdf
    • http://volarovo.fairytale-wedding.ca/uploads/1/3/1/8/131857631/1156315.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/6028/0982/files/jevusumi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6663/0050/files/22887544131.pdf
    • https://cdn.shopify.com/s/files/1/0440/0264/0030/files/wezuruwi.pdf
    • https://cdn.shopify.com/s/files/1/0452/5296/8605/files/learn_astrology_in_tamil_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/8385/8080/files/fenobasarewetemugiwuzo.pdf
    • https://cdn.shopify.com/s/files/1/0432/3239/5426/files/75648210906.pdf
    • https://cdn.shopify.com/s/files/1/0432/4474/8950/files/20223654405.pdf
    • https://cdn.shopify.com/s/files/1/0440/6778/2821/files/periodic_table.pdf
    • https://cdn.shopify.com/s/files/1/0432/8289/0918/files/69477936743.pdf
    • https://cdn.shopify.com/s/files/1/0428/6509/8908/files/wugisobunujunige.pdf
    • https://cdn.shopify.com/s/files/1/0432/8688/8612/files/83853477994.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gopag.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/35022180152.pdf
    • https://cdn.shopify.com/s/files/1/0430/4253/7629/files/72993985485.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_off00006205.bin
efdf8771df6afa457ee9e67dc194ec3b84f3f62203b0394d2648f9434cd845be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6205 5300 bytes
font_01_sfnt_off000073d4.bin
1125612b1aba3e3524113256f7abfce21558d485c661f5addcd2a6a9cd041ee9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73D4 12084 bytes

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