Malicious PDF — malware analysis report

Static analysis result for SHA-256 38ee0f33f2afa131…

MALICIOUS

PDF

47.5 KB Created: 2020-08-21 09:14:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7524f56ccb31005bd24766620c37b2f SHA-1: a59ed64bea762bb1f568d57626e86d3fcfcd6007 SHA-256: 38ee0f33f2afa131e6d252909f832017e9f178ad05ad15e3ed95572deb4a3078
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a malicious redirector link disguised as a document about bioelectrical impedance analysis. The link `https://ttraff.cc/pify?keyword=bioelectrical+impedance+analysis+pdf` is a critical finding, indicating a likely attempt to redirect the user to a malicious site. The presence of a large number of external PDF links also suggests a link farm or SEO poisoning tactic. No scripts were extracted, but the embedded malicious URL is sufficient evidence for the attack pattern.

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=bioelectrical+impedance+analysis+pdf
    • http://xifupab.friendsofbirleyspa.org/uploads/1/3/0/8/130814761/kejepuvadegopexit.pdf
    • http://files.revoltiao.co/uploads/1/3/1/3/131398194/pidiza.pdf
    • http://jusipojor.savoringcharlotte.com/uploads/1/3/1/1/131163599/sikeregako_jokowif_pedir.pdf
    • https://cdn.shopify.com/s/files/1/0433/4603/4853/files/22012077630.pdf
    • https://cdn.shopify.com/s/files/1/0437/3302/4929/files/sqrt_function_python.pdf
    • https://cdn.shopify.com/s/files/1/0435/1305/3338/files/vagijezogegejina.pdf
    • https://cdn.shopify.com/s/files/1/0431/7957/3414/files/marubajejovavikoxofuvomi.pdf
    • https://cdn.shopify.com/s/files/1/0434/2710/2876/files/marriage_in_islam_book.pdf
    • https://cdn.shopify.com/s/files/1/0435/8150/5695/files/anime_drawing_references.pdf
    • https://cdn.shopify.com/s/files/1/0432/8315/3056/files/57253002599.pdf
    • https://cdn.shopify.com/s/files/1/0431/0515/7284/files/26197120986.pdf
    • https://cdn.shopify.com/s/files/1/0430/4614/2114/files/arborescence_site_web_exemple.pdf
    • https://cdn.shopify.com/s/files/1/0433/9236/8798/files/70289403926.pdf
    • https://cdn.shopify.com/s/files/1/0432/2482/6014/files/37781635117.pdf
    • https://cdn.shopify.com/s/files/1/0430/4227/5485/files/insanity_workout_online.pdf
    • https://cdn.shopify.com/s/files/1/0463/2798/8385/files/79625296815.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_off00007add.bin
8e579d6edac6a556f968ad50a289128bada46dd719d71984c1ee790dd5a88b1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7ADD 5452 bytes
font_01_sfnt_off00008d51.bin
54e0335b2471ec906da67044e4e2154fd984722bda5695b6a99052707599b809		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D51 10404 bytes

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