Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cdc7cae81d8aa0d…

MALICIOUS

PDF

38.6 KB Created: 2020-08-09 17:38:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5db4c2000aa03ef016c91ada602f741 SHA-1: 27652837cbb2ebe91a1f5e264de8df4f634133d6 SHA-256: 7cdc7cae81d8aa0d26893643f3bf98a0fdb292d1ec9d4d0a093fd0eeb6c6a118
128 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDFs, a common tactic for SEO poisoning and traffic generation. One critical heuristic identified a link to a known malicious redirector, ttraff.com, which is used to obscure the final destination. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. The presence of a 'download button' heuristic further supports the social engineering aspect of this attack.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=amrita+pritam+books+pdf+download
    • http://zubovedu.livehealthywithcancer.com/uploads/1/3/0/8/130814535/1d6637a29dcd.pdf
    • http://files.bourbeau-voice-dynamics.com/uploads/1/3/0/7/130775558/ziraful.pdf
    • http://lofodekud.chalmersphoto.com/uploads/1/3/1/4/131407005/3f00db.pdf
    • https://cdn.shopify.com/s/files/1/0429/3197/8403/files/a_level_computer_science_notes.pdf
    • https://cdn.shopify.com/s/files/1/0432/3213/3278/files/pesajenoti.pdf
    • https://cdn.shopify.com/s/files/1/0434/5197/3799/files/pre_calculus_11_bc_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0431/0273/2448/files/43530761198.pdf
    • https://cdn.shopify.com/s/files/1/0437/0890/7688/files/78941093737.pdf
    • https://cdn.shopify.com/s/files/1/0430/5797/1362/files/fish_tank_stardew_valley.pdf
    • https://cdn.shopify.com/s/files/1/0428/4655/2227/files/wutokirilirega.pdf
    • https://cdn.shopify.com/s/files/1/0430/1327/5811/files/37127855018.pdf
    • https://cdn.shopify.com/s/files/1/0438/4528/8093/files/vadif.pdf
    • https://cdn.shopify.com/s/files/1/0437/3302/4929/files/st_cyril_of_alexandria.pdf
    • https://cdn.shopify.com/s/files/1/0437/7791/7085/files/ontology_matching.pdf
    • https://cdn.shopify.com/s/files/1/0431/6263/2360/files/pagudogavuvenidelowaro.pdf
    • https://cdn.shopify.com/s/files/1/0431/4326/6458/files/54702512736.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_off00005883.bin
0d374f3532ad6210dc49576ed8673d61e1554508b92d2467ef5f7aa3ac02d16a
pdf-font-stream PDF embedded font (sfnt) at offset 0x5883 5472 bytes
font_01_sfnt_off00006b12.bin
16c1531aab2e96341faf72947012d3ac57b81b425192af048f6d22746d62729b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B12 10024 bytes