Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1503a6b383a4ae8…

MALICIOUS

PDF

70.3 KB Created: 2020-08-12 12:59:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e67f627677ba76d0697e76c7748e1cc7 SHA-1: 17d61738b9b199066f5fbffcfe53732ceb27b11c SHA-256: e1503a6b383a4ae8b1ed258d5242bf730e683d8107661c0fb901d43794271fa9
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL that triggers this redirection. The presence of a link farm and the ML classifier's high confidence further support the malicious nature of this document, which is designed to lead users to harmful content.

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=list%20of%20common%20integrals%20pdf
    • http://files.desertcrewphotography.com/uploads/1/3/1/6/131607232/b4d7d20c.pdf
    • http://files.gawaterfalls.com/uploads/1/3/2/6/132695418/resixoxuvagafak.pdf
    • http://files.alamosavalleyhumaneleague.org/uploads/1/3/1/3/131383791/10af04.pdf
    • https://cdn.shopify.com/s/files/1/0438/0524/5597/files/80650243924.pdf
    • https://cdn.shopify.com/s/files/1/0427/7387/2807/files/yamaha_rx-_v375_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/5698/8317/files/pixukavevufamame.pdf
    • https://cdn.shopify.com/s/files/1/0433/5520/9886/files/8962713369.pdf
    • https://cdn.shopify.com/s/files/1/0440/3943/8486/files/98837426039.pdf
    • https://cdn.shopify.com/s/files/1/0431/8108/0738/files/welob.pdf
    • https://cdn.shopify.com/s/files/1/0428/6644/2406/files/71021946746.pdf
    • https://cdn.shopify.com/s/files/1/0434/0265/7957/files/88593602984.pdf
    • https://cdn.shopify.com/s/files/1/0433/7316/6744/files/losoxuvizagofuf.pdf
    • https://cdn.shopify.com/s/files/1/0437/0428/7383/files/4th_grade_math_exam.pdf
    • https://cdn.shopify.com/s/files/1/0431/6332/0471/files/64970126164.pdf
    • https://cdn.shopify.com/s/files/1/0433/7837/6853/files/22335129634.pdf
    • https://cdn.shopify.com/s/files/1/0433/0664/7707/files/ritewera.pdf
    • https://cdn.shopify.com/s/files/1/0428/3206/8775/files/govonufivetodepi.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_off0000af4d.bin
f86cce0c5a8cb2d4833704b5ea24783887212148faafc2da69ccf4444e2ae5ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF4D 5416 bytes
font_01_sfnt_off0000c1a2.bin
5ac73350f407960a8aad50bebc461311574432fa883c8642c09ad50f69a90b5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A2 16872 bytes
font_02_sfnt_off0000f693.bin
502241521b9a747e1ffbe603c4ce4fa25ddc58327f1965af51796015835e6730		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF693 16220 bytes

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