Malicious PDF — malware analysis report

Static analysis result for SHA-256 ade0683a75338bc9…

MALICIOUS

PDF

32.6 KB Created: 2020-09-18 17:40:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5d740fb5ae5473dfcdbe551d20ae6a0 SHA-1: 69a1ca052ff6f99dde5d5c539d42a127c5d3c855 SHA-256: ade0683a75338bc97cb36b64eab7316baf69490cc2d09c6193ee2ee71a35b20a
152 Risk Score

Malware Insights

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

The PDF contains a prominent link disguised as a 'Wascomat washer service manual' that leads to a malicious redirector. This is further supported by heuristics indicating a malicious redirector link and a PDF link farm, suggesting a phishing or malware distribution attempt. The ML classifier also strongly flagged this PDF as malicious.

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.club/wix?keyword=wascomat+washer+service+manual
    • http://files.ionoptical.com/uploads/1/3/2/6/132682235/kekuja.pdf
    • http://files.jeremywolin.com/uploads/1/3/1/4/131407227/9155308.pdf
    • http://files.jancancan.com/uploads/1/3/1/4/131406413/sosazidisajawaj-ledosol-vaxodavuv-ziwobedomanefon.pdf
    • http://lofexo.febcoparts.com/uploads/1/3/1/3/131380213/ff27cd.pdf
    • http://files.butchfriedrichsfoundation.org/uploads/1/3/1/4/131453784/bufoz.pdf
    • http://files.katyfaceinvestigations.com/uploads/1/3/1/4/131407571/7a31d967eb417a0.pdf
    • https://5498e511-fbbf-4e3e-9517-823355efebba.filesusr.com/ugd/04e6f9_0d94d2d7b2054f32a1ab87f07373b02c.pdf?index=true
    • https://f1751c51-1b2c-421e-97b4-8ec66bf28e3b.filesusr.com/ugd/ccf397_1090c73775bf4112b03cffb09ce2e4b0.pdf?index=true
    • https://04adb5b8-ed10-4791-b08a-687b9cbd08da.filesusr.com/ugd/dba42a_c9a404dd4de44d94a4bacae93bdec5aa.pdf?index=true
    • https://2d8f929a-d03a-433c-ac40-088524f42d27.filesusr.com/ugd/ee9d3f_2a56128cc63a45e5883fe7ee1162f260.pdf?index=true
    • https://bbf5ec1a-e33b-4795-936a-822ba9b2964a.filesusr.com/ugd/b28561_2d10d565c33a458487c95d5a4e86a146.pdf?index=true
    • https://a31daffd-762e-476e-a89d-b80c11d0f2fa.filesusr.com/ugd/361045_6cfcd3ad7dba4b219ce615b4d48785bc.pdf?index=true
    • https://7004d4e1-e213-4fd0-80ed-6557788a0ad3.filesusr.com/ugd/9f06f8_687518fe99c04e1985a951d591ec2a8e.pdf?index=true
    • https://36bc0ba7-384a-4f14-9c80-bf59269fea38.filesusr.com/ugd/fd3290_e665002049d845c6bc9c9b20a72294d5.pdf?index=true
    • 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_off0000447c.bin
6065f1bf9dd6139a1f041c6a7931c2a33327c1bac50c5f3650920af47bc06709		 pdf-font-stream PDF embedded font (sfnt) at offset 0x447C 5204 bytes
font_01_sfnt_off0000561f.bin
ef092202f84038f1b8ca529f503a4f7a8a3669261eca8043e3b663e7a394b9c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x561F 9332 bytes

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