Malicious PDF — malware analysis report

Static analysis result for SHA-256 de91ba801b6b1f82…

MALICIOUS

PDF

52.4 KB Created: 2020-08-19 10:21:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb0729e2a6aa10dacc1f8f3b9fb9a59c SHA-1: ecfe2d6ab520c743d746d929aad2816c3faf1293 SHA-256: de91ba801b6b1f82817a161beecc98d6ef4b0f4f748d7407ebd7d4a319e8cc5a
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, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=remington+steele+episode+guide', which is a critical finding. The presence of numerous links, many pointing to shopify.com, suggests a link farm or SEO poisoning technique to distribute malicious content. 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.ru/pify?keyword=remington+steele+episode+guide
    • http://files.secondwindpdx.com/uploads/1/3/1/4/131454603/1497737.pdf
    • http://files.forgetmenotsmovie.com/uploads/1/3/0/7/130775840/gimewov.pdf
    • http://files.starfishlbicharters.com/uploads/1/3/0/7/130775544/zojiza.pdf
    • https://cdn.shopify.com/s/files/1/0433/1978/7675/files/ff14_focus_target.pdf
    • https://cdn.shopify.com/s/files/1/0428/2010/8444/files/nijirolebolekemajurajefo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6472/9512/files/63000286698.pdf
    • https://cdn.shopify.com/s/files/1/0431/0053/6986/files/2937269777.pdf
    • https://cdn.shopify.com/s/files/1/0430/4610/9341/files/30529928110.pdf
    • https://cdn.shopify.com/s/files/1/0434/8579/0365/files/83907516628.pdf
    • https://cdn.shopify.com/s/files/1/0429/0658/3203/files/algebra_2_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0437/4416/6037/files/benjamin_franklin_autobiography_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/3235/4711/files/vebawubulemisubojijedu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7344/5792/files/73236355667.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/muzaloxebomasu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7453/5067/files/77737399999.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_off0000911e.bin
2285649e5ab6cd965581606ecd5c9465f6d00eea5cd741332a4ce2a17bb8a4c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x911E 4980 bytes
font_01_sfnt_off0000a206.bin
abf64e04cdceed745976baab4fbc98579f5b82fac97fd47084357fd61c9ce247
pdf-font-stream PDF embedded font (sfnt) at offset 0xA206 10172 bytes