Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdb15076febb34b7…

MALICIOUS

PDF

60.3 KB Created: 2020-08-08 21:41:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f4ad19189141010b0d7d1fa123472f7 SHA-1: 524079f9935ddcdf68b8a909708010cad8f567fe SHA-256: bdb15076febb34b701f7a1dac7dbb93a2918c850ec81bd5e3fa912bf3b59bebe
152 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=chelating+agents+and+metal+chelates+pdf'. The document body, though heavily obfuscated, also contains this URL, suggesting it is a primary lure. The ML classifier strongly flagged this PDF as malicious, reinforcing the assessment of a malicious redirector or phishing attempt.

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=chelating+agents+and+metal+chelates+pdf
    • http://files.yogakathryn.com/uploads/1/3/0/7/130775171/dixedupunatufudujiz.pdf
    • http://vevizev.merionmillhouse.com/uploads/1/3/1/4/131483154/volopepeb_kifejesapo_fexatopolazase.pdf
    • http://jewidir.kipandfriends.com/uploads/1/3/0/7/130776262/cee0976805fc.pdf
    • http://files.ukinvestmentstamps.com/uploads/1/3/1/3/131380354/1a2722e1.pdf
    • http://zuvoz.shopcharmhousedecor.com/uploads/1/3/1/3/131383664/jureru.pdf
    • https://cdn.shopify.com/s/files/1/0431/0571/4338/files/rapuvonasizipiza.pdf
    • https://cdn.shopify.com/s/files/1/0436/1024/3230/files/98539794338.pdf
    • https://cdn.shopify.com/s/files/1/0431/2511/2994/files/80184533763.pdf
    • https://cdn.shopify.com/s/files/1/0429/6749/8911/files/90108618276.pdf
    • https://cdn.shopify.com/s/files/1/0434/5056/4773/files/dokomaxikef.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2960/files/sausage_party_full_movie_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pufabupenidobuxix.pdf
    • https://cdn.shopify.com/s/files/1/0429/6785/9359/files/94389636383.pdf
    • https://cdn.shopify.com/s/files/1/0435/2360/4631/files/tenukivupatugewexixev.pdf
    • https://cdn.shopify.com/s/files/1/0432/9200/0406/files/nilididiwodufebozedu.pdf
    • https://cdn.shopify.com/s/files/1/0432/1977/9742/files/tivosilesitajibotes.pdf
    • https://cdn.shopify.com/s/files/1/0429/7120/1695/files/77173131766.pdf
    • https://cdn.shopify.com/s/files/1/0430/6681/8721/files/kasakinomowojigamizis.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_off00008bd2.bin
3436f1a33a4de9d82d269414b9122b049552d47b0a3f2133d53f29664c670761		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BD2 5376 bytes
font_01_sfnt_off00009df8.bin
cb458a61c696a6f5ccd78ec7d27eb06e1569ed47f50a6eb297a94b65a0974915		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DF8 15036 bytes
font_02_sfnt_off0000cd30.bin
593ff223002b46858d9ccb817f3a3baeae454b89d4dd5b9dfd3fb02882520774		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD30 16396 bytes

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