Malicious PDF — malware analysis report

Static analysis result for SHA-256 996c65aec5b90699…

MALICIOUS

PDF

36.6 KB Created: 2020-08-07 22:12:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb3b9b8c4fa1f891a37a435c18da9c0b SHA-1: a71091e6115b597882b0785da56804c1ad676e8a SHA-256: 996c65aec5b906996f4a0707822a4c65db9c53f5fa2b54f0aa253284a7479da9
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical link identified as a malicious redirector. The document body, though partially corrupted, contains text referencing a service manual and includes the malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier strongly flagged this PDF as malicious.

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/wb?keyword=packard%20bell%20easynote%20te11hc%20service%20manual
    • http://files.journeytothethrone.com/uploads/1/3/2/7/132710632/babaxejeleje.pdf
    • http://files.gbyws.org/uploads/1/3/1/4/131483019/paludizixi-pazibokadelok-xovubonavegazuz-nobuxudisapefod.pdf
    • http://files.whspkggapp.com/uploads/1/3/0/7/130740524/03636f01f4cd.pdf
    • https://cdn.shopify.com/s/files/1/0431/3900/6632/files/30628787704.pdf
    • https://cdn.shopify.com/s/files/1/0434/8870/6717/files/46860116161.pdf
    • https://cdn.shopify.com/s/files/1/0429/0691/0876/files/sujisamulife.pdf
    • https://cdn.shopify.com/s/files/1/0437/2529/1674/files/81757867097.pdf
    • https://cdn.shopify.com/s/files/1/0431/2917/6232/files/wuxon.pdf
    • https://cdn.shopify.com/s/files/1/0434/6334/4280/files/53742027905.pdf
    • https://cdn.shopify.com/s/files/1/0440/0244/3422/files/anemia_normositik_normokrom_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0438/1681/2706/files/16791621344.pdf
    • https://cdn.shopify.com/s/files/1/0436/0224/7838/files/68429170300.pdf
    • https://cdn.shopify.com/s/files/1/0434/7399/3890/files/jafam.pdf
    • https://cdn.shopify.com/s/files/1/0448/4674/3713/files/effects_of_transatlantic_slave_trade.pdf
    • https://cdn.shopify.com/s/files/1/0437/3823/5031/files/24821767366.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_off00004649.bin
4239adec9bf326a3e920b5bb36cc57e0658bfce9476618c367d61a68728402ce
pdf-font-stream PDF embedded font (sfnt) at offset 0x4649 5480 bytes
font_01_sfnt_off000058c4.bin
fba3f9408243f8682024dbb2c395ea8b46fa9d3b5203d01952593379af396fd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x58C4 8884 bytes
font_02_sfnt_off00007721.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x7721 4324 bytes