Malicious PDF — malware analysis report

Static analysis result for SHA-256 967835f56e1e0561…

MALICIOUS

PDF

50.3 KB Created: 2020-08-07 03:33:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f60c7771629ec83cfade3f83463bb596 SHA-1: 294c73a28ac43922940a3e047f16344ba96f8efe SHA-256: 967835f56e1e05618dbc9cdfc7e3017ab7d9ca5ec96a47a8f044213d84716ba1
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The primary malicious link, https://ttraff.com/pify?keyword=process+planning+and+cost+estimation+textbook+pdf, is designed to lure users into clicking by appearing as a search result for a textbook. The document body, though heavily obfuscated, contains references to the same malicious URL and appears to be generated by wkhtmltopdf, a tool often used to create malicious PDFs. The presence of a link farm further supports the malicious intent.

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=process+planning+and+cost+estimation+textbook+pdf
    • http://files.brcwrt.com/uploads/1/3/1/4/131409090/1113484.pdf
    • http://juwoza.brentkinworthy.com/uploads/1/3/0/7/130775162/jarav-sidabepud-bekunabuzo.pdf
    • http://files.erictigley.com/uploads/1/3/1/4/131409264/0e52cf8.pdf
    • http://files.charlottemullich.com/uploads/1/3/1/4/131437064/zanalunotaro-kofabilegepokoz.pdf
    • http://files.westwoodgrowers.com/uploads/1/3/0/8/130814432/sebomu.pdf
    • https://cdn.shopify.com/s/files/1/0433/9305/6933/files/cub_cadet_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/8369/4247/files/jemokibulixefugog.pdf
    • https://cdn.shopify.com/s/files/1/0428/6667/1782/files/50095464129.pdf
    • https://cdn.shopify.com/s/files/1/0429/6825/2565/files/36932161162.pdf
    • https://cdn.shopify.com/s/files/1/0431/5742/2229/files/61218661005.pdf
    • https://cdn.shopify.com/s/files/1/0432/4855/0050/files/titrasi_argentometri.pdf
    • https://cdn.shopify.com/s/files/1/0434/5511/9512/files/99196858045.pdf
    • https://cdn.shopify.com/s/files/1/0431/5637/3659/files/begegotovelolutafiz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/96226605796.pdf
    • https://cdn.shopify.com/s/files/1/0431/2550/6208/files/42_constitutional_amendment_act.pdf
    • https://cdn.shopify.com/s/files/1/0437/7945/7173/files/acuerdos_internacionales_del_medio_ambiente.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/69143450337.pdf
    • https://cdn.shopify.com/s/files/1/0435/5463/5937/files/albertine_disparue_proust.pdf
    • https://cdn.shopify.com/s/files/1/0437/4193/7818/files/53537081162.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_off00007200.bin
51fd50adb5da335c038a43dbda09c616265be222af3722e66596de5c5b9e7654		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7200 5748 bytes
font_01_sfnt_off00008578.bin
49f1c345582212729590e0456707ca92d3838aef8cba26fbcaa28f8c5b0a0640		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8578 2116 bytes
font_02_sfnt_off00008f43.bin
686c14202174b3a22f6a2825ce7fc2aaf94f2b4b891265a61e79d6a6c19988f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F43 13996 bytes

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