Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0cadccae93f4f6d…

MALICIOUS

PDF

35.8 KB Created: 2020-08-06 05:26:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3991aa199ebdd78a4a6dfae90be2f891 SHA-1: e7d63701d1f09bbca84b7a539cad8657d3b83d38 SHA-256: a0cadccae93f4f6d919a274e48199fd1462ef9af23e083e9d2461087324438a3
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though partially corrupted, contains the URL 'https://ttraff.cc/pify?keyword=autonics+rotary+encoder+e50s8+pdf', which is likely intended to lure the user into clicking through to a malicious site. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute the malicious 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/pify?keyword=autonics+rotary+encoder+e50s8+pdf
    • http://files.spinecarechiropractic.net/uploads/1/3/1/3/131384018/30437.pdf
    • http://files.plantpartners.org/uploads/1/3/1/3/131380612/wanuwinogu-visorerazatep.pdf
    • http://files.legacy-systems.net/uploads/1/3/1/4/131453539/9026b.pdf
    • http://files.plantcitypsych.com/uploads/1/3/1/4/131406430/meruzofede-fekunuzubomipid.pdf
    • https://cdn.shopify.com/s/files/1/0439/4716/3806/files/38445182926.pdf
    • https://cdn.shopify.com/s/files/1/0428/2122/2567/files/free_reloading_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/1872/2216/files/ios_10._2_beta_5.pdf
    • https://cdn.shopify.com/s/files/1/0431/4575/6821/files/dejuwawazupevuwekawi.pdf
    • https://cdn.shopify.com/s/files/1/0430/8575/8617/files/99734466089.pdf
    • https://cdn.shopify.com/s/files/1/0435/9448/1821/files/aptransco_sub_engineer_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0440/2829/7381/files/ripisuponaruriv.pdf
    • https://cdn.shopify.com/s/files/1/0430/9119/8112/files/43737991198.pdf
    • https://cdn.shopify.com/s/files/1/0435/5883/0231/files/fexenolebupexesigaw.pdf
    • https://cdn.shopify.com/s/files/1/0432/4117/7248/files/ancient_warfare_mod_wiki.pdf
    • https://cdn.shopify.com/s/files/1/0428/8295/7478/files/integrative_approaches_to_psychology_and_christianity_entwistle.pdf
    • https://cdn.shopify.com/s/files/1/0435/1839/4523/files/you_lost_me_lyrics.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_off00004969.bin
22cc2f2373539d2cb02e1cfb11c4f28161ca2a3e92ef95dfeee127f02f759ae4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4969 5668 bytes
font_01_sfnt_off00005cd5.bin
07d4295955b940461ce3345f8ce15fa6bc99dce80d5347534631c1154a78b391		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CD5 10468 bytes

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