Malicious PDF — malware analysis report

Static analysis result for SHA-256 37142e3bd0182868…

MALICIOUS

PDF

33.1 KB Created: 2020-08-03 21:53:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dcdec67c6ab220c69b3529ec7e89efc9 SHA-1: 7bb4d2fd779b6fd0520767c8439114073f64e39f SHA-256: 37142e3bd0182868adce57f55f8a1775348a5f149f4c9479a3b0ee57eea6bd14
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to a redirector service. The primary redirector URL is https://ttraff.ru/pify?keyword=msds+acido+citrico+pdf, which is flagged as malicious. The document body itself contains garbled text but also includes the malicious URL and several benign-looking Shopify URLs, suggesting a lure to disguise the malicious intent. The ML classifier strongly indicated maliciousness, supporting the presence of a link farm designed to lead users to harmful 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.ru/pify?keyword=msds+acido+citrico+pdf
    • http://files.leemg.org/uploads/1/3/1/4/131438658/genuworogat_pumopabarukaz_rozidemine.pdf
    • http://vapojo.greypartners.com/uploads/1/3/0/7/130775934/4369153.pdf
    • http://files.harvardseducation.com.au/uploads/1/3/1/3/131383838/nolonufix_xutojibemaka_dojigutatepubal.pdf
    • http://files.simplyhairandbeauty.com/uploads/1/3/0/7/130775677/95ae54c.pdf
    • http://files.kingsburg4h.com/uploads/1/3/1/3/131384432/javusenixi_timoxidof_tupobow_fimalomurukezi.pdf
    • https://cdn.shopify.com/s/files/1/0429/7208/6423/files/7599889046.pdf
    • https://cdn.shopify.com/s/files/1/0430/5698/8317/files/12217094902.pdf
    • https://cdn.shopify.com/s/files/1/0430/9313/1425/files/71833422794.pdf
    • https://cdn.shopify.com/s/files/1/0428/9937/4236/files/93556541120.pdf
    • https://cdn.shopify.com/s/files/1/0433/3921/9099/files/rurunovexiladuvin.pdf
    • https://cdn.shopify.com/s/files/1/0428/5209/0022/files/dutatigaj.pdf
    • https://cdn.shopify.com/s/files/1/0440/3773/4550/files/74656216364.pdf
    • https://cdn.shopify.com/s/files/1/0431/6859/6123/files/havel_s_ring_ds3.pdf
    • https://cdn.shopify.com/s/files/1/0431/9592/4637/files/download_from_archive._org.pdf
    • https://cdn.shopify.com/s/files/1/0432/2613/6731/files/lozifopazokob.pdf
    • https://cdn.shopify.com/s/files/1/0435/4375/6954/files/12558967325.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000046f1.bin
615815be0c4a56aeaf27620f62664a8352b3d24bd15b10c8359425d70362564d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x46F1 5120 bytes
font_01_sfnt_off00005875.bin
fa17d8805e5a310c68cc9e7ed64f64add540f45a0f52088177a2c81c32d7f493		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5875 9128 bytes

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