Malicious PDF — malware analysis report

Static analysis result for SHA-256 26b50b2417f36e49…

MALICIOUS

PDF

56.7 KB Created: 2020-08-02 15:44:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1be7549fd6bb75413a296d795c88b38f SHA-1: 0538090dd5fafa58026ca85e4c4b8115855b3452 SHA-256: 26b50b2417f36e49aca13b14eb66954055fb6fce03a4c242da198b5f97deca1e
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though partially corrupted, contains text related to 'Use github to host website' and the malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier also strongly flagged this PDF as malicious.

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=use+github+to+host+website
    • http://files.teamtowpathroadracing.com/uploads/1/3/2/3/132303001/7133077.pdf
    • http://files.elocaldelivery.com/uploads/1/3/1/0/131069899/5188692.pdf
    • http://files.crystalcoastbooks.com/uploads/1/3/1/0/131069764/miwiritawi_zorarela_butamek_laxizabuniv.pdf
    • http://files.crimeintelanalysis.org/uploads/1/3/1/0/131070113/piferipuvugo_mikebodid_nukuve.pdf
    • https://cdn.shopify.com/s/files/1/0435/8628/9832/files/74754322131.pdf
    • https://cdn.shopify.com/s/files/1/0431/2960/2205/files/29073407955.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/20726054751.pdf
    • https://cdn.shopify.com/s/files/1/0428/4655/2230/files/wepesisiranovepizu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0911/3240/files/lekalopikiwetonukoniwotej.pdf
    • https://cdn.shopify.com/s/files/1/0430/9948/8410/files/73026952706.pdf
    • https://cdn.shopify.com/s/files/1/0429/9338/5633/files/36030406762.pdf
    • https://cdn.shopify.com/s/files/1/0432/7201/1941/files/falanit.pdf
    • https://cdn.shopify.com/s/files/1/0429/8869/9802/files/osu_skins_cookiezi.pdf
    • https://cdn.shopify.com/s/files/1/0437/0841/6168/files/50851918956.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_off00008669.bin
62d9808a6fbb9a97860cfc6c84a07a0c38cd822198588b2fe5dcccb92732973d
pdf-font-stream PDF embedded font (sfnt) at offset 0x8669 4608 bytes
font_01_sfnt_off00009638.bin
238913f1f60d1d8f939c8c5a66deead92873f35792010072386a776c8e5b0410
pdf-font-stream PDF embedded font (sfnt) at offset 0x9638 15616 bytes
font_02_sfnt_off0000c78b.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0xC78B 4324 bytes