Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d9d4e915a83bbeb…

MALICIOUS

PDF

62.6 KB Created: 2020-08-03 07:31:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b7e175178ab2401b39986d6ddcbb2cc SHA-1: 17e1e1dcc274f86dd75a1ea3f2f8ea80b6d768af SHA-256: 1d9d4e915a83bbeb3400ab377edb46c328bc58014e6a204f351107879d2b7daa
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains multiple heuristics indicating malicious intent. Specifically, it includes a link to a known malicious redirector at 'ttraff.com' and a large number of external links, suggesting a link farm or SEO poisoning tactic. The document body, though heavily obfuscated, also contains the malicious redirector URL and several benign-looking PDF links hosted on Shopify, likely to lend legitimacy. No scripts were extracted, but the primary attack vector appears to be social engineering through malicious links.

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=sunglasses+emoji+copy+and+paste
    • http://files.lrse-nd.org/uploads/1/3/1/4/131438397/6696206.pdf
    • http://files.gratitudeismyreligion.com/uploads/1/3/1/3/131380063/xuvakebalugo-zinigupivupoxev-kivaka.pdf
    • http://files.gretchenkelleywrites.com/uploads/1/3/2/7/132740445/1cace892910.pdf
    • http://files.trinitypreparatoryschoolnj.com/uploads/1/3/2/6/132683014/cab99ba2a0ec2.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/89120948070.pdf
    • https://cdn.shopify.com/s/files/1/0431/2858/6402/files/33082952565.pdf
    • https://cdn.shopify.com/s/files/1/0438/7805/6091/files/ruwogujelawedonesiperejek.pdf
    • https://cdn.shopify.com/s/files/1/0430/4535/5682/files/fepedadoxibamopimev.pdf
    • https://cdn.shopify.com/s/files/1/0429/4112/0679/files/java_concepts_7th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wonazonuv.pdf
    • https://cdn.shopify.com/s/files/1/0429/9977/5381/files/gifok.pdf
    • https://cdn.shopify.com/s/files/1/0436/6509/6857/files/1816911085.pdf
    • https://cdn.shopify.com/s/files/1/0433/0664/7717/files/buboronadakazekono.pdf
    • https://cdn.shopify.com/s/files/1/0438/6547/3189/files/zowuduzenanadawegafomizon.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00007eee.bin
a1fc5c0fcabfd3be585a64de96dd574834a4a370ee4a958ba480c107a3973439		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x7EEE 12276 bytes
font_00_sfnt_off00005dfb.bin
47972cfdc0fef60f6394453941b332aeb9212c68fd2e9c401a12710b37e7f8e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DFB 3896 bytes
font_01_sfnt_off00006bfb.bin
e87a7c687a119f3fbaf5c2d8a035a0a8263d2e201cd62028712c58ef6c7a3f55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BFB 5580 bytes
font_03_sfnt_off0000a697.bin
83e968ed804afac2909a162a0d48accb67cc39fa4a6d0d46ae8b49fafb4490d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA697 11896 bytes
font_04_sfnt_off0000cf3c.bin
30f807ce945697f620d65182cfa1c0c41278c92cbd8e2502c4886051e5cdc447		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3C 18544 bytes

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