Malicious PDF — malware analysis report

Static analysis result for SHA-256 8789b76c325f1117…

MALICIOUS

PDF

34.2 KB Created: 2020-08-01 16:00:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e55415ec515f280a14c6823689136e6 SHA-1: fe1d1a727b60e519057178216ee215b0ab1fc14a SHA-256: 8789b76c325f1117832aede9b83e9104d5cb4f9c84848d8bc58aa045d5fd1c5e
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 pointing to Shopify domains, which is indicative of a link farm. One critical heuristic identified a link to a known malicious redirector, 'ttraff.cc', which likely serves as the initial stage for distributing further malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted from this sample.

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.cc/pify?keyword=one+direction+teenage+dirtbag
    • http://files.hearttoheartfarm.com/uploads/1/3/1/4/131453024/929535.pdf
    • http://files.tysonbodnarchuk.ca/uploads/1/3/0/7/130776483/ae64a8936.pdf
    • http://files.weightlosswithannamarie.com/uploads/1/3/2/6/132682851/gatuz.pdf
    • http://files.sciencefarts.com/uploads/1/3/1/3/131379894/e1b35.pdf
    • https://cdn.shopify.com/s/files/1/0432/3993/2064/files/18744521751.pdf
    • https://cdn.shopify.com/s/files/1/0430/1278/4277/files/niwik.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51220099535.pdf
    • https://cdn.shopify.com/s/files/1/0428/3187/2166/files/61376554322.pdf
    • https://cdn.shopify.com/s/files/1/0431/4945/9605/files/kutukaluminukijobunub.pdf
    • https://cdn.shopify.com/s/files/1/0431/7354/4093/files/zakaxir.pdf
    • https://cdn.shopify.com/s/files/1/0432/8259/6004/files/gefimorisagoxodirona.pdf
    • https://cdn.shopify.com/s/files/1/0430/4768/2201/files/sarafego.pdf
    • https://cdn.shopify.com/s/files/1/0436/8665/8213/files/jitadajezikopimugebigar.pdf
    • https://cdn.shopify.com/s/files/1/0430/2022/2627/files/surevufudixal.pdf
    • https://cdn.shopify.com/s/files/1/0437/1608/3877/files/46370741090.pdf
    • https://cdn.shopify.com/s/files/1/0432/6653/9673/files/jusetogupifozuxasalazivaf.pdf
    • https://cdn.shopify.com/s/files/1/0440/7079/7462/files/89665450699.pdf
    • https://cdn.shopify.com/s/files/1/0427/7728/0671/files/33991526731.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_off000049e8.bin
267f4d14ed7a5f655d34508d8f2894ac67dc9c72c15486bb707e00f7ca212849
pdf-font-stream PDF embedded font (sfnt) at offset 0x49E8 5064 bytes
font_01_sfnt_off00005b26.bin
afb3c8e56b08fcd78b677e81be6c61e5a6b04f7b860ac19349da7a82e1174149
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B26 9724 bytes