Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dba2d1ae77097a0…

MALICIOUS

PDF

33.6 KB Created: 2020-08-21 01:04:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb7d68a62167baa2fdca59bb0df49549 SHA-1: c1ef939a8736b8edf4cc2d4fe3c2bd3108ecf167 SHA-256: 8dba2d1ae77097a0279718ed30cf718a47a46a6d9fa1a9c44e0b00363f758d01
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains a high number of embedded links, many pointing to Shopify domains hosting other PDFs, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to a known malicious redirector at 'ttraff.com'. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains the title 'Spongebob theme song instrumental' and the malicious redirector URL, reinforcing the lure.

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.com/pify?keyword=spongebob+theme+song+instrumental
    • http://files.bcdpartistry.com/uploads/1/3/1/3/131383931/5445231.pdf
    • http://files.nadjalitau-photography.com/uploads/1/3/1/1/131163927/752769c31d396f.pdf
    • http://jonifiwux.thomasmusehold.de/uploads/1/3/0/9/130969754/8631485.pdf
    • https://cdn.shopify.com/s/files/1/0437/0209/1929/files/alkyl_substituents.pdf
    • https://cdn.shopify.com/s/files/1/0432/2171/3060/files/nuzatotunaw.pdf
    • https://cdn.shopify.com/s/files/1/0429/9934/9407/files/ecologia_microbiana_y_microbiologia_ambiental.pdf
    • https://cdn.shopify.com/s/files/1/0431/9110/7742/files/sizamifalidiwodogod.pdf
    • https://cdn.shopify.com/s/files/1/0431/8789/6488/files/amazing_grace_g_major.pdf
    • https://cdn.shopify.com/s/files/1/0431/3507/4465/files/zabasizadibonorim.pdf
    • https://cdn.shopify.com/s/files/1/0434/4047/2214/files/53907969138.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_off00004568.bin
08b253f6ae864ee29897023e9a199af61ed256894c39556645b836eafb460cba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4568 5476 bytes
font_01_sfnt_off000057cf.bin
7bd535f1ee66ba40b059e0482a299edece9db9ba3053b2e0f5ffa3abdcd0c810		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57CF 9956 bytes

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