Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d8404b99d7771df…

MALICIOUS

PDF

42.0 KB Created: 2020-08-19 03:07:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea36c4ceca982c7982d51e1bdf483c9e SHA-1: 4e2af5125eeab3ce1b1be8cfbb63b305583cc0bf SHA-256: 3d8404b99d7771df8f367b6e65ee0fa131d1c5927cce45f53326d261259a449e
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many of which point to a link farm hosted on cdn.shopify.com, and one critical link to a known malicious redirector at ttraff.com. The ML classifier strongly indicated maliciousness, and the presence of a malicious redirector suggests an attempt to lead the user to a malicious site, likely for phishing or malware distribution. No scripts were extracted, and the document body contained mostly binary data and metadata, making the analysis reliant on the PDF-specific heuristics and URL analysis.

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=kingsoft+spreadsheets+free+2013
    • http://batud.whiskyimpressions.com/uploads/1/3/1/3/131383329/gusira-rigasif.pdf
    • http://files.merakifair.com/uploads/1/3/1/4/131452880/5999390.pdf
    • http://fesemuwi.margaretlacostedesigns.com/uploads/1/3/1/4/131453723/3477994.pdf
    • http://files.turtletoesfootwearandboutique.com/uploads/1/3/0/7/130740521/kobozowi.pdf
    • http://sorebipev.theoxytocinproject.com/uploads/1/3/2/7/132712207/ced49d45b820ad.pdf
    • https://cdn.shopify.com/s/files/1/0430/2536/7193/files/fewusaporaviwijemu.pdf
    • https://cdn.shopify.com/s/files/1/0434/7058/6016/files/2018_camaro_ss_manual_review.pdf
    • https://cdn.shopify.com/s/files/1/0437/2656/9633/files/witanalinufad.pdf
    • https://cdn.shopify.com/s/files/1/0437/0805/5720/files/add_watermark_to_adobe_acrobat_reader_dc.pdf
    • https://cdn.shopify.com/s/files/1/0438/9902/7611/files/najiferokalor.pdf
    • https://cdn.shopify.com/s/files/1/0434/0393/5911/files/48938860635.pdf
    • https://cdn.shopify.com/s/files/1/0432/7643/5612/files/jajejibuzebud.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3087/files/57336879206.pdf
    • https://cdn.shopify.com/s/files/1/0432/0336/2973/files/pokemon_crystal_cheats_rare_candy.pdf
    • https://cdn.shopify.com/s/files/1/0437/7408/3233/files/xokajav.pdf
    • https://cdn.shopify.com/s/files/1/0429/4233/3084/files/76157865745.pdf
    • https://cdn.shopify.com/s/files/1/0434/1052/2279/files/wijaweropudoredebegitu.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_off00005df8.bin
75c7f183ebadd935a913f12f6b997e088ddf30b0cb30970d9b343ed5b12f209e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DF8 5732 bytes
font_01_sfnt_off0000717e.bin
2ecfcf3cfb7fc8e8f38fd45dfb9f6a396b189fc92c6b4be91746fa2024fa874d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x717E 15000 bytes

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