Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6f8f3cb57cae0b6…

MALICIOUS

PDF

37.4 KB Created: 2020-08-05 13:19:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5a28223c41b8c33c33dea7aefbfc89f SHA-1: 476ca84766da19a97e8e96cdcdcd9f4286cbee5c SHA-256: b6f8f3cb57cae0b6ac446f9d80fc8115f62146b1681f93245f9a97df4b3b7f5e
152 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 pointing to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is likely the primary malicious payload delivery mechanism. The document body, though heavily obfuscated, contains the same malicious URL, reinforcing the lure. No scripts were extracted from this sample.

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.cc/pify?keyword=epigenetic+principles+of+evolution+pdf
    • http://files.inside-osijek.com/uploads/1/3/1/8/131856333/limunazolorug_wagox_xebawowobowi_xasifomuwob.pdf
    • http://files.mkemixers.org/uploads/1/3/0/7/130776215/6783611.pdf
    • http://files.kitbernal.com/uploads/1/3/2/7/132740362/zukokosotizovowifeg.pdf
    • https://cdn.shopify.com/s/files/1/0431/0607/4780/files/xewebewofa.pdf
    • https://cdn.shopify.com/s/files/1/0428/7807/5036/files/nizitipofot.pdf
    • https://cdn.shopify.com/s/files/1/0436/6965/1609/files/what_is_the_best_csgo_gambling_site.pdf
    • https://cdn.shopify.com/s/files/1/0429/4865/7311/files/jovufezuvu.pdf
    • https://cdn.shopify.com/s/files/1/0436/1561/7182/files/29734131695.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/78046530146.pdf
    • https://cdn.shopify.com/s/files/1/0429/1811/7543/files/medobisazevar.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3097/files/91084062563.pdf
    • https://cdn.shopify.com/s/files/1/0430/8323/5489/files/kiluwitufot.pdf
    • https://cdn.shopify.com/s/files/1/0437/2273/5767/files/47204186159.pdf
    • https://cdn.shopify.com/s/files/1/0435/9431/7981/files/astrology_a_guide_to_understanding_your_birth_chart.pdf
    • https://cdn.shopify.com/s/files/1/0431/8016/3227/files/pafag.pdf
    • https://cdn.shopify.com/s/files/1/0430/2536/7194/files/wings_of_fire_book_in_kannada_free_download.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_off0000548c.bin
301933116547be0df0f40d9ffea0c81d4a3bd17737fa874058cb4d9309ca8a3d
pdf-font-stream PDF embedded font (sfnt) at offset 0x548C 5128 bytes
font_01_sfnt_off00006625.bin
f2832326e8b400d69c9d9746cc5258e3f0f69b1ecf1e191a8294bdc984bc409e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6625 10128 bytes