Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd4f35cf0b041d2b…

MALICIOUS

PDF

42.9 KB Created: 2020-08-03 04:14:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c4767551dae48b7b5679316cbfaee29 SHA-1: 64e85656ef32fd51abac1b91692f679377c2f480 SHA-256: cd4f35cf0b041d2b8133e994172e427cd2e0d0ecca0375ff8752675f76eeffbd
154 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body contains a URL pointing to a redirector service, which is likely used to direct users to malicious content or phishing pages. The presence of numerous external links, many pointing to the same redirector, suggests a campaign aimed at driving traffic to potentially harmful sites.

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=flexbar+tennis+elbow
    • http://files.ruggyd.us/uploads/1/3/0/7/130740530/9035e542d.pdf
    • http://files.handmaidsoftheheartofjesus.com/uploads/1/3/0/7/130739180/kovinawuvul-nobulemodixar-mojimilosaparof-mezuxeva.pdf
    • http://files.artisansbycj.com/uploads/1/3/0/8/130874154/5131921.pdf
    • http://files.suzanneandrewsfunctionalfitness.com/uploads/1/3/2/7/132740892/09303.pdf
    • http://files.inspiredmindstutoring.com/uploads/1/3/1/8/131856723/puwezifit.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/92161478626.pdf
    • https://cdn.shopify.com/s/files/1/0431/7901/6360/files/york_chiller_manuals.pdf
    • https://cdn.shopify.com/s/files/1/0429/8627/4967/files/vewesasusu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8390/6724/files/kavulebigudi.pdf
    • https://cdn.shopify.com/s/files/1/0432/7142/2102/files/gesivaw.pdf
    • https://cdn.shopify.com/s/files/1/0431/5827/4205/files/saneroxozip.pdf
    • https://cdn.shopify.com/s/files/1/0434/3257/5132/files/dujupipubir.pdf
    • https://cdn.shopify.com/s/files/1/0433/9813/5966/files/rugegejujokoja.pdf
    • https://cdn.shopify.com/s/files/1/0433/9869/3013/files/moxikawarukikipotunavibik.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20424522606.pdf
    • https://cdn.shopify.com/s/files/1/0432/5300/6494/files/29288079048.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_off00006c97.bin
d4bc404d918aae96d9dfd6d5be0434d809128a1974506f0debf9d07f8d34dfb7
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C97 4932 bytes
font_01_sfnt_off00007d83.bin
2d30d9f46a5a9da0be53d68124ebf4d9553d5b7f2fcaeae0a875d01420f95303
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D83 9760 bytes