Malicious PDF — malware analysis report

Static analysis result for SHA-256 a67cc4affa5f04b9…

MALICIOUS

PDF

43.7 KB Created: 2020-08-09 02:25:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0fccece55d60377c2323b6a70bef64d8 SHA-1: b1c42becab037ac0844583e88aad09d58967c0bc SHA-256: a67cc4affa5f04b989a0b79b25b2032032244089ee01905e6f6947a0d7c84067
152 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by a machine learning classifier and contains a significant number of embedded links. One of these links, 'https://ttraff.ru/pify?keyword=booth+algorithm+in+computer+architecture+and+organization+pdf', points to known malicious redirector infrastructure. The document body, though heavily obfuscated, also contains this URL and numerous other links hosted on Shopify, suggesting a link farm designed to distribute malicious content or phish users.

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=booth+algorithm+in+computer+architecture+and+organization+pdf
    • http://files.orionreads.org/uploads/1/3/1/8/131857442/19480f70.pdf
    • http://files.christianlindke.com/uploads/1/3/0/7/130775229/bopurenulakoke.pdf
    • http://files.texashollandlops.com/uploads/1/3/1/3/131379371/7953459.pdf
    • http://files.onceuponatimewells.com.au/uploads/1/3/1/4/131438847/f628b67a.pdf
    • http://kelegid.nscasa.org/uploads/1/3/0/8/130813747/1f01c19df36d9.pdf
    • https://cdn.shopify.com/s/files/1/0433/7372/3800/files/pafavalerikituviwesoveve.pdf
    • https://cdn.shopify.com/s/files/1/0431/1112/1057/files/xavepirerifupizinusob.pdf
    • https://cdn.shopify.com/s/files/1/0438/9902/7611/files/84519959049.pdf
    • https://cdn.shopify.com/s/files/1/0427/4431/6070/files/pdf_mail_merge_plugin.pdf
    • https://cdn.shopify.com/s/files/1/0438/6937/2576/files/84323134912.pdf
    • https://cdn.shopify.com/s/files/1/0430/3981/7890/files/42448027875.pdf
    • https://cdn.shopify.com/s/files/1/0432/7574/7483/files/11583008824.pdf
    • https://cdn.shopify.com/s/files/1/0428/9213/2508/files/amarakosha_malayalam.pdf
    • https://cdn.shopify.com/s/files/1/0437/8768/1954/files/que_es_el_aprendizaje_significativo.pdf
    • https://cdn.shopify.com/s/files/1/0430/3015/1330/files/nudugorupatuwawawuvoxiji.pdf
    • https://cdn.shopify.com/s/files/1/0438/0976/7584/files/79072853179.pdf
    • https://cdn.shopify.com/s/files/1/0434/5787/2039/files/gedenejesavowolidapi.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_off00005cf5.bin
361a22566e79a388c539907ff14a5774a8c013b2aea6bbea18113dc4d16bbf51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CF5 5488 bytes
font_01_sfnt_off00006f41.bin
fecdc1be9fbca5edf5f71ffa26a665fc07b69ef0d92ce07c3236febf95bc503b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F41 6300 bytes
font_02_sfnt_off00007e9a.bin
a342a99c6ef6bd4d1c687e551765c732a66e650450f8663b277a431e511fcb90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E9A 10080 bytes

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