Malicious PDF — malware analysis report

Static analysis result for SHA-256 14da8cfb5eb32052…

MALICIOUS

PDF

42.6 KB Created: 2020-08-03 18:15:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9fe2ef5fdbaff3592f79557c88b341ab SHA-1: 482d51fb82cd8ddb4d36b02a394c867945aca5d5 SHA-256: 14da8cfb5eb320527f3df667a9ce53b569472c662da3993a6dff6deab349311e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to benign Shopify domains, but one critical link directs to a known malicious redirector. This suggests a link farm or SEO poisoning tactic to distribute malicious content. 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=arduino+lcd+projects+pdf
    • http://files.zeinalameddinephotography.com/uploads/1/3/1/8/131857544/52cc39.pdf
    • http://files.theatreguildsimsbury.org/uploads/1/3/1/4/131438113/xodet_pogafu_gamafo_madufugox.pdf
    • http://files.communitychurchsheppey.com/uploads/1/3/0/8/130874318/49948dc.pdf
    • http://files.onehumanfamily.org/uploads/1/3/0/9/130969370/dipoje-kixevomit.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/1701/1353/files/2518013421.pdf
    • https://cdn.shopify.com/s/files/1/0432/5395/6758/files/moonrise_kingdom_poster.pdf
    • https://cdn.shopify.com/s/files/1/0433/0097/8853/files/sezokuwo.pdf
    • https://cdn.shopify.com/s/files/1/0430/7252/0352/files/86435595501.pdf
    • https://cdn.shopify.com/s/files/1/0434/8998/4674/files/wejivak.pdf
    • https://cdn.shopify.com/s/files/1/0431/0381/3781/files/72927986031.pdf
    • https://cdn.shopify.com/s/files/1/0430/9286/9281/files/91345711493.pdf
    • https://cdn.shopify.com/s/files/1/0436/5982/1209/files/fowinadikekililoxodezo.pdf
    • https://cdn.shopify.com/s/files/1/0428/7997/5590/files/68002451962.pdf
    • https://cdn.shopify.com/s/files/1/0428/3016/8230/files/38441596353.pdf
    • https://cdn.shopify.com/s/files/1/0429/5432/6179/files/30386041513.pdf
    • https://cdn.shopify.com/s/files/1/0429/0723/8567/files/17754632703.pdf
    • https://cdn.shopify.com/s/files/1/0431/6856/3355/files/43141301024.pdf
    • https://cdn.shopify.com/s/files/1/0431/6823/5682/files/wexakalarisilerinoponobat.pdf
    • https://cdn.shopify.com/s/files/1/0435/2986/3320/files/60489335714.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_off000066f1.bin
c2735c5547184759afc4eb5f77bb787b4066bea9524f2294963ea30d4dbdf7a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66F1 5004 bytes
font_01_sfnt_off00007810.bin
d8a80c07eb1380090e17141b6d13e03b5ce00228200b1eac5d94ad487d71ec0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7810 10996 bytes

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