Malicious PDF — malware analysis report

Static analysis result for SHA-256 e13b6e9cfdc4f462…

MALICIOUS

PDF

45.1 KB Created: 2020-08-23 18:39:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 358b340d957c6362dcf5b3d6deb7d459 SHA-1: f26337f09fca328dcd9c069bdf60882cda1ec02e SHA-256: e13b6e9cfdc4f462db0d5f2cd0d1b6acccd913b45035ab7445e6a9d35bdf6bf5
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 for a malicious redirector. The document body, though partially corrupted, contains text related to '1st grade language arts worksheets pdf', suggesting a lure to disguise malicious links. The primary malicious URL identified is ttraff.ru, which is used in conjunction with a keyword search to appear as a legitimate search result. The ML classifier also strongly indicated maliciousness.

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.ru/pify?keyword=1st+grade+language+arts+worksheets+pdf
    • http://xolidikol.tracygrammer.com/uploads/1/3/1/4/131453960/2566f6969680.pdf
    • http://zamuzevup.bcox1.com/uploads/1/3/1/8/131871592/mafatobemutam_nalovu_petodaputebeni_rawugatuw.pdf
    • http://gujis.photography-timeless.com/uploads/1/3/0/7/130775519/2349148.pdf
    • http://vunowibo.fayedelgezry.com/uploads/1/3/1/1/131164132/vowopozugoz.pdf
    • http://zamuzevup.bcox1.com/uploads/1
    • https://cdn.shopify.com/s/files/1/0431/8098/2436/files/wobajokege.pdf
    • https://cdn.shopify.com/s/files/1/0432/9452/3552/files/dump._dump_asap_ferg.pdf
    • https://cdn.shopify.com/s/files/1/0438/4364/9698/files/elementary_introduction_to_statistical_learning_theory.pdf
    • https://cdn.shopify.com/s/files/1/0435/9097/5647/files/kofojosibuj.pdf
    • https://cdn.shopify.com/s/files/1/0461/4950/1091/files/87961677362.pdf
    • https://cdn.shopify.com/s/files/1/0432/6617/9230/files/dovazugedobalu.pdf
    • https://cdn.shopify.com/s/files/1/0438/6773/4176/files/zulawelabesopaxakalef.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/13652925252.pdf
    • https://cdn.shopify.com/s/files/1/0437/0730/2037/files/89535757298.pdf
    • https://cdn.shopify.com/s/files/1/0435/4621/4564/files/lomutagotap.pdf
    • https://cdn.shopify.com/s/files/1/0429/9754/7157/files/67033050615.pdf
    • https://cdn.shopify.com/s/files/1/0431/2471/9773/files/33543684172.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_off000071e2.bin
c459cf44e7b014fb6db5b767c533a1ddabb99f0c5bf22fde7164b7623bcb4b19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71E2 5416 bytes
font_01_sfnt_off0000845b.bin
9d6290496dda4bc4ca2d999811ba7a1e47332a5cd26347446d89f935787a213e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x845B 10120 bytes

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