Malicious PDF — malware analysis report

Static analysis result for SHA-256 681a38dc73ae4c22…

MALICIOUS

PDF

46.2 KB Created: 2020-08-03 10:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 56c922224208d528ccb404f0739676f4 SHA-1: 5e633a0bb72e30c249c917f28b9e292aec900e69 SHA-256: 681a38dc73ae4c224ea740f101dfd9f4cf1b2ab9e214425b5adb40438f7fa837
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to link farms designed to manipulate search engine results. One critical heuristic identified a link to known malicious redirector infrastructure at 'ttraff.com'. The document body, though obfuscated, contains the text 'American red cross lifeguard manual pdf' and the malicious URL, suggesting a lure to trick users into visiting potentially harmful sites.

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=american+red+cross+lifeguard+manual+pdf
    • http://files.annagalatirealtor.com/uploads/1/3/0/7/130776718/979473.pdf
    • http://files.silkenfest2017.com/uploads/1/3/1/3/131383342/00507d6f2a50.pdf
    • http://files.kennel-midepra.com/uploads/1/3/1/4/131437377/vukigufusural.pdf
    • http://files.thegardentoronto.com/uploads/1/3/1/4/131482941/nuluvopugonumebudo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1970/6269/files/fosubazosufelamikojiled.pdf
    • https://cdn.shopify.com/s/files/1/0434/1504/4245/files/vanut.pdf
    • https://cdn.shopify.com/s/files/1/0428/4389/8019/files/84700432679.pdf
    • https://cdn.shopify.com/s/files/1/0432/1024/4256/files/37761473473.pdf
    • https://cdn.shopify.com/s/files/1/0430/7730/4484/files/gemivu.pdf
    • https://cdn.shopify.com/s/files/1/0433/9453/1493/files/maxudumewajirowiribuwov.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/luzugojozawok.pdf
    • https://cdn.shopify.com/s/files/1/0438/0937/4365/files/gexidakopenikojavet.pdf
    • https://cdn.shopify.com/s/files/1/0429/7441/2949/files/bavogoluve.pdf
    • https://cdn.shopify.com/s/files/1/0437/9482/5376/files/penugun.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000763e.bin
7884724f3f73b452c9ae4c99db152d4f7fecb7633c1a9b369b36c68a5c8d0050
pdf-font-stream PDF embedded font (sfnt) at offset 0x763E 5464 bytes
font_01_sfnt_off000088c3.bin
69a94cc8dbb55528b1f1a74a8586aaa5fcd22e43718df55ec3f5df7265704664
pdf-font-stream PDF embedded font (sfnt) at offset 0x88C3 10332 bytes