Malicious PDF — malware analysis report

Static analysis result for SHA-256 c028807b72c3dd30…

MALICIOUS

PDF

46.6 KB Created: 2020-07-31 05:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1152d9e64dca7119f640ee0b932859b7 SHA-1: b1c147e94c5a95fc7b36d102e3378105e1df2967 SHA-256: c028807b72c3dd3020c5b0d92372fc4ba87aed8c6342edea8f5e627ad297c78a
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is further supported by a large number of embedded external links, indicating a link farm. The ML classifier also strongly flagged this PDF as malicious. The primary malicious URL identified is https://ttraff.cc/pify?keyword=acrobat+pdf+reader+windows+7+free+download, which is designed to lure users into downloading potentially harmful software by impersonating a legitimate download. The document body, though heavily obfuscated, contains keywords related to software downloads, reinforcing the lure.

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=acrobat+pdf+reader+windows+7+free+download
    • http://files.debshill.com/uploads/1/3/1/4/131452741/mireraleren-wozebisogerig.pdf
    • http://files.grahamlloydmusic.com/uploads/1/3/1/4/131453114/simovak_razuvujinege_dapufupo.pdf
    • http://files.montevallocp.com/uploads/1/3/1/3/131383924/3023850.pdf
    • http://files.janelincove.com/uploads/1/3/1/4/131406379/rafuziv-fatimu-xijelarutina-legonazixo.pdf
    • http://files.westerfieldadventures.com/uploads/1/3/1/8/131856772/xugamomorenax.pdf
    • http://files.janelinco
    • https://cdn.shopify.com/s/files/1/0433/3659/7654/files/mekuruxikegewawita.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3097/files/nelabagemivi.pdf
    • https://cdn.shopify.com/s/files/1/0429/9672/7957/files/wijitipigirumasopudegafu.pdf
    • https://cdn.shopify.com/s/files/1/0436/0772/0094/files/21092983586.pdf
    • https://cdn.shopify.com/s/files/1/0431/7937/6798/files/34812965628.pdf
    • https://cdn.shopify.com/s/files/1/0429/9735/0554/files/79681096131.pdf
    • https://cdn.shopify.com/s/files/1/0436/3943/9510/files/votusixo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/581871399.pdf
    • https://cdn.shopify.com/s/files/1/0437/4416/6037/files/83475908948.pdf
    • https://cdn.shopify.com/s/files/1/0432/6631/0299/files/49971014066.pdf
    • https://cdn.shopify.com/s/files/1/0433/4691/9579/files/97854007583.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_off0000788c.bin
5059f5ec453ea8d743eb04203c9c4daa84640bef8df02fc8165d7f27f2e7fe9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x788C 5236 bytes
font_01_sfnt_off00008a71.bin
cc2f6786aa4fa664cc2eb4ec0418cd1a95dc9dfd2cd8ea830f9acc11660d3481		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A71 10156 bytes

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