Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc5243189408c846…

MALICIOUS

PDF

58.4 KB Created: 2020-08-05 12:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1181c273106591b314f8208af68e31d8 SHA-1: 1885e030854a997523d637c455eddcd7f11a492d SHA-256: bc5243189408c846b40bb4c51069b447730413f503e382fbf93f4d9a5bbc4b79
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to Shopify-hosted PDFs, creating a link farm. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=namakam+chamakam+pdf'. This suggests the document's primary purpose is to redirect users to malicious sites, likely for further exploitation or phishing.

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=namakam+chamakam+pdf
    • http://files.abeadjustso.com/uploads/1/3/0/7/130775603/madunotajixebokiru.pdf
    • http://files.eastmsnwaams.com/uploads/1/3/1/8/131856160/fotam-rolibetofomezu-lorar-roxajesig.pdf
    • http://files.andreakober.com/uploads/1/3/1/4/131454317/nasavekamisa.pdf
    • https://cdn.shopify.com/s/files/1/0428/0510/0711/files/nojitenepuzivetelaji.pdf
    • https://cdn.shopify.com/s/files/1/0430/4388/1114/files/fevawidixaxiwibazonukuk.pdf
    • https://cdn.shopify.com/s/files/1/0433/6045/2760/files/75642502981.pdf
    • https://cdn.shopify.com/s/files/1/0431/4149/6981/files/vokedop.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gerakofidasetivivirodipel.pdf
    • https://cdn.shopify.com/s/files/1/0433/4957/3784/files/didoxetukubametevu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3546/7682/files/53013283810.pdf
    • https://cdn.shopify.com/s/files/1/0432/7908/9824/files/radezesodi.pdf
    • https://cdn.shopify.com/s/files/1/0431/3962/9218/files/89196645819.pdf
    • https://cdn.shopify.com/s/files/1/0428/7053/8406/files/fesatodixifawula.pdf
    • https://cdn.shopify.com/s/files/1/0434/6052/6246/files/troll_craft_mod_pack.pdf
    • https://cdn.shopify.com/s/files/1/0434/0069/1866/files/26710735468.pdf
    • https://cdn.shopify.com/s/files/1/0432/7846/7222/files/67745378303.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000903c.bin
399aee34a86b907bf475c180b33992763b8f60fb002b4e2ca951dd872f23d486		 pdf-font-stream PDF embedded font (sfnt) at offset 0x903C 5124 bytes
font_01_sfnt_off0000a192.bin
5696cedce26640762b17faa08e31de5363124c490e6d0b1e7977596f0f5177eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA192 14656 bytes
font_02_sfnt_off0000cfad.bin
ad33e86631bcb0361aa26ce4a4d1da5923b5438afcd807ff380166cf01e988c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFAD 3304 bytes

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