Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a885d8c69373b6e…

MALICIOUS

PDF

141.5 KB Created: 2020-08-24 01:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb60879d7c6a8667eea01ff4c3955820 SHA-1: 74d4723ca24321ce89d394097d953aa84d965554 SHA-256: 1a885d8c69373b6e349f1bf8eb970e3879c5b189040ae3b923596b1eb1a24402
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a critical heuristic indicating it links to known malicious redirector infrastructure. It also contains a large number of external PDF links, forming a link farm. The primary malicious URL identified is 'https://ttraff.cc/pify?keyword=semitic+languages+pdf', which is likely used to funnel victims to further malicious content. No scripts were extracted, and the document body was heavily obfuscated, but the presence of the malicious redirector is sufficient evidence for this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=semitic+languages+pdf
    • http://files.creatingforachange.com/uploads/1/3/0/7/130775361/211f0c.pdf
    • http://files.snowyriverfarms.com/uploads/1/3/0/8/130874125/jojugowominisedetif.pdf
    • http://files.annagalatirealtor.com/uploads/1/3/1/4/131452887/rulosoxuzonug.pdf
    • https://cdn.shopify.com/s/files/1/0433/8476/6620/files/34654634794.pdf
    • https://cdn.shopify.com/s/files/1/0428/2885/7503/files/8735497741.pdf
    • https://cdn.shopify.com/s/files/1/0428/5680/8607/files/vemomef.pdf
    • https://cdn.shopify.com/s/files/1/0435/2344/0799/files/22728261578.pdf
    • https://cdn.shopify.com/s/files/1/0431/2724/2903/files/foruzunufuwokalabesegek.pdf
    • https://cdn.shopify.com/s/files/1/0448/9995/8939/files/92686109375.pdf
    • https://cdn.shopify.com/s/files/1/0434/3421/3538/files/video_catcher_apk.pdf
    • https://cdn.shopify.com/s/files/1/0433/4243/0362/files/51542973961.pdf
    • https://cdn.shopify.com/s/files/1/0428/8774/1599/files/62580224551.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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0001c845.bin
5dbaf13018603bdd2babf2f455ea6bc5d5aeb3ebfbdec86fc5159a7d031e410c		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1C845 27436 bytes
font_00_sfnt_off000146d7.bin
84c3963fb06f5e63092262caead053215b110e94e44ac85df0bb765b8ae631c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x146D7 13688 bytes
font_01_sfnt_off00016c28.bin
a4f0901f8993a87486a91f10c460a94680410a18f7a3e79dc31996fe7d10db4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16C28 5252 bytes
font_02_sfnt_off00017deb.bin
99e6124e557d744646ba42e3b49f7f62c5509c23674ba11655a813f8ae669a77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17DEB 26780 bytes
font_04_sfnt_off0001f96a.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1F96A 4324 bytes
font_05_sfnt_off0002072f.bin
2ab9e7f2f7c4416cfcf71563af14aa697fa8043b3fec1afaa28ca9e97c5a8e64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2072F 11012 bytes

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