Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcee4e7811d8420f…

MALICIOUS

PDF

52.7 KB Created: 2020-08-20 03:41:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 143c142443750ca82b45476862e6fac6 SHA-1: 03d5d55f7b79d2439e31b13b13e480a50abd4554 SHA-256: bcee4e7811d8420f92b2c7f8a2bfe2117e0432458d3d05570d26eb40f6e15ef2
152 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external links, including a critical redirector link to ttraff.com. This indicates a likely attempt to lure users to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious redirector URL and the link farm structure strongly suggest a phishing or redirection attack.

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=martensite+to+austenite+transformation
    • http://files.raisingtheblues.net/uploads/1/3/1/0/131070712/luwot_fokoxatenotuwi_bogezuvirep_gobedejazojisi.pdf
    • http://files.irwa45.org/uploads/1/3/1/6/131637658/1a60233.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/19252536586.pdf
    • https://cdn.shopify.com/s/files/1/0437/6700/5333/files/developing_countries_problems_and_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0431/9281/1681/files/16204711022.pdf
    • https://cdn.shopify.com/s/files/1/0438/8651/0232/files/46189599617.pdf
    • https://cdn.shopify.com/s/files/1/0429/7211/9199/files/45084927698.pdf
    • https://cdn.shopify.com/s/files/1/0440/7482/7941/files/bamboo_timber_sheets_nz.pdf
    • https://cdn.shopify.com/s/files/1/0436/2282/6142/files/44878586947.pdf
    • https://cdn.shopify.com/s/files/1/0440/1322/4094/files/vazujabiwepuvukafojejobon.pdf
    • https://cdn.shopify.com/s/files/1/0433/0940/0214/files/kubosujetilegofilar.pdf
    • https://cdn.shopify.com/s/files/1/0437/7840/8609/files/apprendre_le_francais_gratuit_debutant.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_off00008459.bin
ccfcf9fa406a411a37fe55d50093676a2537e1e48313be356313b2f901030690
pdf-font-stream PDF embedded font (sfnt) at offset 0x8459 4884 bytes
font_01_sfnt_off000094e3.bin
71b0ef072b0e718a7ee7cf028ab2e53fe2f276a8feaf1a5df2bb23b239818068
pdf-font-stream PDF embedded font (sfnt) at offset 0x94E3 15348 bytes