Malicious PDF — malware analysis report

Static analysis result for SHA-256 a17746247d04dbf3…

MALICIOUS

PDF

46.6 KB Created: 2020-08-06 12:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f764427cb62ceda4b1c0a8841b762719 SHA-1: c38ed887debb682d603c20a696dea18576a808ae SHA-256: a17746247d04dbf3cfd82c902dae2051bce6c2c01735f52a4bae031ea7f8f4df
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/pify?keyword=adobe+acrobat+pdf+reader+for+windows+7'. This indicates the document is designed to redirect users to malicious infrastructure. Additionally, the PDF hosts a link farm with numerous external PDF links, many hosted on cdn.shopify.com, suggesting a tactic to broaden reach or evade detection. The ML classifier also 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/pify?keyword=adobe+acrobat+pdf+reader+for+windows+7
    • http://files.mariosmathtutoring.com/uploads/1/3/1/1/131164023/zewet-suremejeru-xowofatada-nizon.pdf
    • http://files.susanmeehan.net/uploads/1/3/0/7/130739616/dofur_rogur.pdf
    • http://files.gritiyacctv.com/uploads/1/3/0/9/130969298/nizufalunudedi.pdf
    • https://cdn.shopify.com/s/files/1/0433/9613/7111/files/mortal_kombat_blaze.pdf
    • https://cdn.shopify.com/s/files/1/0432/5313/7576/files/wajapivulitelojiravug.pdf
    • https://cdn.shopify.com/s/files/1/0431/7573/9553/files/17004705844.pdf
    • https://cdn.shopify.com/s/files/1/0430/6350/9143/files/lemirukowojusuwizipej.pdf
    • https://cdn.shopify.com/s/files/1/0438/8945/9368/files/48728850762.pdf
    • https://cdn.shopify.com/s/files/1/0433/9607/1578/files/74197298004.pdf
    • https://cdn.shopify.com/s/files/1/0428/1165/4307/files/real_estate_company_structure.pdf
    • https://cdn.shopify.com/s/files/1/0446/9365/1610/files/phases_of_gastric_secretion.pdf
    • https://cdn.shopify.com/s/files/1/0429/6104/3605/files/63218074027.pdf
    • https://cdn.shopify.com/s/files/1/0432/2790/6206/files/44845693912.pdf
    • https://cdn.shopify.com/s/files/1/0431/0820/4701/files/risikorisekazevav.pdf
    • https://cdn.shopify.com/s/files/1/0431/5214/6587/files/80049284081.pdf
    • https://cdn.shopify.com/s/files/1/0430/2825/0781/files/33390371715.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_off000063b9.bin
b18a9b14697c510477559dcc79ea4a898150a34cb366a36a6bd111f9cf801464		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63B9 5208 bytes
font_01_sfnt_off0000758d.bin
416b558e2dfb47c0dbe834170ccff6efff2207b4a1fe25ddaa98a55eda2a0025		 pdf-font-stream PDF embedded font (sfnt) at offset 0x758D 13032 bytes
font_02_sfnt_off00009f55.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F55 4324 bytes

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