Malicious PDF — malware analysis report

Static analysis result for SHA-256 a38a1c7913e8154f…

MALICIOUS

PDF

47.5 KB Created: 2020-08-24 06:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c06918ae475082b8c775cdd8867a8e3 SHA-1: 5fe87f04d143bab630d0c9e5de729424b5860314 SHA-256: a38a1c7913e8154f3e3587bd97097326b8198a67315d7a9bb62f16c1ab9664b8
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious domain, ttraff.com, disguised as interview questions. This indicates a phishing or social engineering attempt to lure the user to a malicious site. The PDF also contains a large number of external links, many pointing to Shopify domains, suggesting a link farm or SEO manipulation tactic to obscure the malicious redirector.

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=basic+interview+questions+and+answers+for+experienced
    • http://sofogez.tlccasolafarms.com/uploads/1/3/1/3/131379730/8438514.pdf
    • http://files.camdenauction.com/uploads/1/3/0/9/130969472/losumetu-fasokuka-wovivexosib.pdf
    • http://files.raiareads.com/uploads/1/3/1/4/131406437/gipapadodatiru.pdf
    • http://nitokuped.peterfrankturl.co.uk/uploads/1/3/1/4/131438157/turagirutadumam.pdf
    • http://files.dcfhub.com/uploads/1/3/1/1/131163613/3745206.pdf
    • https://cdn.shopify.com/s/files/1/0431/0263/4148/files/lagu_dusk_till_dawn_cover_emma.pdf
    • https://cdn.shopify.com/s/files/1/0429/6110/9155/files/11062219333.pdf
    • https://cdn.shopify.com/s/files/1/0440/3943/8486/files/pokemon_sun_and_moon_animated_sprites.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/2857609843.pdf
    • https://cdn.shopify.com/s/files/1/0430/6976/7842/files/14138366697.pdf
    • https://cdn.shopify.com/s/files/1/0431/3802/3592/files/sonicwall_netextender_setup_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/8850/1143/files/carers_allowance_form_ireland.pdf
    • https://cdn.shopify.com/s/files/1/0428/1240/7967/files/32296386341.pdf
    • https://cdn.shopify.com/s/files/1/0428/5494/0828/files/23210117423.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/
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/2857609

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007ac6.bin
9ed3663f5b6aeb3531dacb1b4f85b3e02e7970a56b5d73477c5535824c1cdd33
pdf-font-stream PDF embedded font (sfnt) at offset 0x7AC6 5512 bytes
font_01_sfnt_off00008da0.bin
b660565846b1f15aeeefd6bb42f7f61d903f4453fd91b58ffb8b5c4ce5690633
pdf-font-stream PDF embedded font (sfnt) at offset 0x8DA0 10240 bytes