Malicious PDF — malware analysis report

Static analysis result for SHA-256 7397e1a7e50d5cde…

MALICIOUS

PDF

44.6 KB Created: 2020-08-20 04:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 577f8157121f25a6cfc0ca35ad815461 SHA-1: 8e5177580b49976776d42948691094294c88dfa8 SHA-256: 7397e1a7e50d5cdec3c3f837dc02a6dc9e1509464605a85f9e4a64befe5721cc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL that triggered the malicious redirector heuristic. The presence of a link farm suggests an attempt to distribute malicious content or engage in SEO manipulation for malicious purposes. No scripts were extracted, but the primary threat is the malicious URL.

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=vidmate+app++2019+apk
    • http://files.ptahoriginals.com/uploads/1/3/1/4/131453897/bukozisakog.pdf
    • http://files.quranhomepro.com/uploads/1/3/1/6/131636954/937c946.pdf
    • http://files.ladyslipperstudios.com/uploads/1/3/0/7/130775490/desus-vagowikawituvul-newopanexi-vukoma.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/3588/5721/files/fenekegenisawepaloxew.pdf
    • https://cdn.shopify.com/s/files/1/0432/7378/1416/files/pajapomefagipozabe.pdf
    • https://cdn.shopify.com/s/files/1/0439/0633/4888/files/revan.pdf
    • https://cdn.shopify.com/s/files/1/0433/0710/6462/files/97143217218.pdf
    • https://cdn.shopify.com/s/files/1/0430/7959/8229/files/ap_literature_exam_2020_multiple_choice.pdf
    • https://cdn.shopify.com/s/files/1/0436/4946/6526/files/yakuza_4_substories.pdf
    • https://cdn.shopify.com/s/files/1/0436/0588/5090/files/12000595485.pdf
    • https://cdn.shopify.com/s/files/1/0428/3128/2335/files/pathfinder_ultimate_campaign.pdf
    • https://cdn.shopify.com/s/files/1/0432/3803/1518/files/vunidivavebuxawedole.pdf
    • https://cdn.shopify.com/s/files/1/0431/2681/6932/files/32700289205.pdf
    • https://cdn.shopify.com/s/files/1/0441/4429/6088/files/fagaseratat.pdf
    • https://cdn.shopify.com/s/files/1/0431/3251/8555/files/24828955225.pdf
    • https://cdn.shopify.com/s/files/1/0440/6090/1528/files/92831018405.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000667e.bin
e211f2d6e0d1bf1fd17bd5150bc2724fb7c0f1d37b1c69b855d9dcad8de34ab0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x667E 2952 bytes
font_01_sfnt_off0000710c.bin
b38780b8134889b73e2f0ca177d924c6308015ffa75a6100ddaa8d0f427ae9ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x710C 5308 bytes
font_02_sfnt_off00008317.bin
d810baef34d0ee2d7f2a8c5b78100fd6dd04d1ad418c43829207c4dc9174a354		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8317 10044 bytes

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