Malicious PDF — malware analysis report

Static analysis result for SHA-256 57a75d4f70e5e9df…

MALICIOUS

PDF

44.0 KB Created: 2020-08-03 04:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0993a4f9ec88561dcfe9d0e7c867905 SHA-1: 08a42b686e16f1aca4684f97f58557b83eb7fb5a SHA-256: 57a75d4f70e5e9dfc3fb31f56a8392f4927909607eeb598e8da581d90f1ad5bb
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 external resources. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=the+norse+myths+kevin+crossley+holland+pdf'. The ML classifier also strongly indicated maliciousness. The document body appears to be corrupted or heavily obfuscated, but the presence of numerous links, including the identified malicious redirector, suggests a link farm attack pattern designed to lead users to 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=the+norse+myths+kevin+crossley+holland+pdf
    • http://files.buchananbioengineering.com/uploads/1/3/1/4/131406811/bixakujozoberig.pdf
    • http://files.familiesrforever.com/uploads/1/3/1/4/131407111/4077565.pdf
    • http://files.srhdonline.org/uploads/1/3/1/3/131398097/zusifediriwiwosapol.pdf
    • http://files.osakislutheranelca.com/uploads/1/3/0/7/130739996/zegisenozi_zapilemanep.pdf
    • http://files.mindfulmilestones.org/uploads/1/3/1/4/131406537/bugilizasowugisi.pdf
    • https://cdn.shopify.com/s/files/1/0435/7003/6904/files/dragon_ball_z_the_history_of_trunks.pdf
    • https://cdn.shopify.com/s/files/1/0431/7642/7686/files/86759278206.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/74195332560.pdf
    • https://cdn.shopify.com/s/files/1/0433/5799/5160/files/75621253216.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/totavari.pdf
    • https://cdn.shopify.com/s/files/1/0430/4224/2709/files/54297375213.pdf
    • https://cdn.shopify.com/s/files/1/0431/1390/6327/files/neseratumi.pdf
    • https://cdn.shopify.com/s/files/1/0430/4207/8877/files/pojaxivu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nitopufekuriwuk.pdf
    • https://cdn.shopify.com/s/files/1/0432/3947/3314/files/fukokarebudojozafogufi.pdf
    • https://cdn.shopify.com/s/files/1/0437/6710/3645/files/gikalatozuxu.pdf
    • https://cdn.shopify.com/s/files/1/0435/1610/0776/files/say_so_wiz_khalifa_download.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_off00006c40.bin
deed618ee70dc189d42dfbb5b1f986915d295eac3b4d273cd56a83265edc1990		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C40 5568 bytes
font_01_sfnt_off00007f0f.bin
7cbc79270ffb7097545c2527aa467f727da22ce6388d51b8957403cc90cfd2b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F0F 10592 bytes

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