Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e16a2646f2049a4…

MALICIOUS

PDF

41.6 KB Created: 2020-08-01 17:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: edc6f6e1b68fa17fb0ca0234a5c75683 SHA-1: 2c82b69edb175a8babe0fa5f33ae7992609ffe42 SHA-256: 4e16a2646f2049a4395dab1962bdc2ec989df7990c1d243053ef458c97f09a6e
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text that appears to be a lure for a textbook, and the primary malicious URL is associated with this lure. The ML classifier strongly supports the malicious verdict. The file is likely a phishing or redirection attempt to a malicious site.

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=macroeconomics+5th+edition+williamson+pdf
    • http://files.collectifcontraceptionliege.com/uploads/1/3/0/7/130740013/2094605.pdf
    • http://files.drifterbrewingsystems.com/uploads/1/3/1/3/131384436/nabaxamas.pdf
    • http://files.fairgreenoutreach.com/uploads/1/3/0/9/130969708/kilunan-bideradenoledob-fezafexivadad-zagufep.pdf
    • http://files.njwsa.org/uploads/1/3/1/4/131453456/b12e3fbc.pdf
    • http://files.pyester.com/uploads/1/3/0/7/130776749/turonevipimiza-xazogavekoluf-riwudojenut.pdf
    • https://cdn.shopify.com/s/files/1/0429/9731/7783/files/dekipubizanufejisez.pdf
    • https://cdn.shopify.com/s/files/1/0428/2315/5878/files/89541113269.pdf
    • https://cdn.shopify.com/s/files/1/0429/5720/9766/files/97523403573.pdf
    • https://cdn.shopify.com/s/files/1/0431/4647/7725/files/pebowusuraga.pdf
    • https://cdn.shopify.com/s/files/1/0428/8197/4435/files/88900385013.pdf
    • https://cdn.shopify.com/s/files/1/0440/7423/8102/files/vapefogozur.pdf
    • https://cdn.shopify.com/s/files/1/0429/6815/4278/files/81692773059.pdf
    • https://cdn.shopify.com/s/files/1/0432/4127/5547/files/19514869320.pdf
    • https://cdn.shopify.com/s/files/1/0433/4537/9478/files/2916008018.pdf
    • https://cdn.shopify.com/s/files/1/0439/4146/2174/files/janefemelaxububebuloki.pdf
    • https://cdn.shopify.com/s/files/1/0435/6079/6318/files/sodamasetonawusaja.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000056c5.bin
0758acd3da6ee765783bb288be0da8a2dffd8fe8cc9b0a66c51d2daf0071aa33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56C5 5404 bytes
font_01_sfnt_off00006908.bin
8627d438519adcf5763b26d28ac86a8c09dded981ba8ec43fe96b83d7dd29cac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6908 10000 bytes
font_02_sfnt_off00008b45.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B45 4324 bytes

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