Malicious PDF — malware analysis report

Static analysis result for SHA-256 94125815ed05dd78…

MALICIOUS

PDF

41.5 KB Created: 2020-08-16 20:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc039c0941b0a94d65820db3822967fe SHA-1: acfc396d5f488453e916f8c584a8fc82ddef47e3 SHA-256: 94125815ed05dd788564a13761558efc5e34704d6c75cfbb1068e591e033c109
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical link pointing to a known malicious redirector infrastructure at 'ttraff.com'. The document body, though heavily obfuscated, contains the same redirector URL and appears to be a lure for a 'lens mounts guide'. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm further supports malicious intent. The primary attack pattern involves tricking the user into clicking the malicious link, likely leading to a further stage of compromise.

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=lens+mounts+guide
    • http://files.creamcityconstruction.com/uploads/1/3/1/0/131070567/jipipop-gusedi-xekor-kagakevi.pdf
    • https://cdn.shopify.com/s/files/1/0428/3678/7356/files/88139395641.pdf
    • https://cdn.shopify.com/s/files/1/0434/4214/3388/files/98873748504.pdf
    • https://cdn.shopify.com/s/files/1/0430/2218/8701/files/kimamevutireboxusapanora.pdf
    • https://cdn.shopify.com/s/files/1/0437/4816/3733/files/gozasasobomometaxaru.pdf
    • https://cdn.shopify.com/s/files/1/0432/9694/8382/files/university_scholarship_application_letter_sample.pdf
    • https://cdn.shopify.com/s/files/1/0434/5249/8070/files/33688496773.pdf
    • https://cdn.shopify.com/s/files/1/0433/8450/4474/files/878988517.pdf
    • https://cdn.shopify.com/s/files/1/0430/4620/7637/files/beyond_compare_mac.pdf
    • https://cdn.shopify.com/s/files/1/0433/8991/1194/files/digonipananikur.pdf
    • https://cdn.shopify.com/s/files/1/0435/9880/7202/files/fusesezofegaxumek.pdf
    • https://cdn.shopify.com/s/files/1/0437/6186/0757/files/lightning_arrester_for_building.pdf
    • https://cdn.shopify.com/s/files/1/0430/8602/0761/files/57728777044.pdf
    • https://cdn.shopify.com/s/files/1/0428/5667/7543/files/juxowod.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_off00006055.bin
eb79e66956ca4d642b8ce730a51d96e264da06ad428fce0cc2392410910881c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x6055 4748 bytes
font_01_sfnt_off00007073.bin
dcba1a0d8fb86c74244cc277727d904902323735ba210966eaac6d3e0bb7fabd
pdf-font-stream PDF embedded font (sfnt) at offset 0x7073 13256 bytes