Malicious PDF — malware analysis report

Static analysis result for SHA-256 afb57c66d0dde859…

MALICIOUS

PDF

54.0 KB Created: 2020-08-07 08:55:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f94b5f95df6ffaceca88c88c52a2209b SHA-1: 4cea9017c4ee535e861d2b32b0a25fd2958251d5 SHA-256: afb57c66d0dde8596e38720a1190799ec68c6b4fdd58adf037d6dd68ddf34c9f
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to what appears to be a link farm designed to mimic legitimate PDF documents. One critical heuristic identified a direct link to a known malicious redirector infrastructure at `https://ttraff.ru/pify?keyword=bonfire+of+the+vanities+book+pdf`. This suggests the document's primary purpose is to lure users to malicious sites. No scripts were extracted from this sample.

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=bonfire+of+the+vanities+book+pdf
    • http://files.ari2extensions.com/uploads/1/3/2/6/132695472/zikubukojawowufeg.pdf
    • http://files.425sqn.org/uploads/1/3/0/7/130740051/5406f.pdf
    • http://files.herrmanndj.com/uploads/1/3/1/4/131483219/zekomesoton_papuzebekufa_notesaj_mozomitixuxol.pdf
    • http://keweduv.lindenhillspottery.com/uploads/1/3/1/4/131437462/8045141.pdf
    • http://genibosa.flixhairandmakeup.co.uk/uploads/1/3/1/4/131453041/bitam-volixinilir-pivijim-lazorolamela.pdf
    • https://cdn.shopify.com/s/files/1/0436/9727/5033/files/bogafiborosidemiguv.pdf
    • https://cdn.shopify.com/s/files/1/0427/7141/5196/files/51890727582.pdf
    • https://cdn.shopify.com/s/files/1/0429/1729/8329/files/phantom_bird_monster_hunter.pdf
    • https://cdn.shopify.com/s/files/1/0432/0844/2020/files/95547603469.pdf
    • https://cdn.shopify.com/s/files/1/0435/3343/5029/files/25878502946.pdf
    • https://cdn.shopify.com/s/files/1/0439/4627/9080/files/mopuluzo.pdf
    • https://cdn.shopify.com/s/files/1/0430/8385/8073/files/witisorepilujibibonuwofip.pdf
    • https://cdn.shopify.com/s/files/1/0434/6429/4557/files/kurupe.pdf
    • https://cdn.shopify.com/s/files/1/0436/2862/6080/files/72063917476.pdf
    • https://cdn.shopify.com/s/files/1/0428/6591/8118/files/anger_management_samhsa_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/1386/4604/files/ibps_bank_clerk_exam_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0433/4410/1544/files/sejezunavuvomuvivepuzof.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007e2b.bin
55c4f30b7add0cc0fa7a4274dda3c5b7caa25a9358352a46d2c0d7700e5fa815		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E2B 5412 bytes
font_01_sfnt_off00009090.bin
c3b0e005b67513d028345911b7a0cf84cd3b59d274628bfd2a4658266a778473		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9090 10404 bytes
font_02_sfnt_off0000b44a.bin
66cd902b334fc3a8a450b3b7a42ffe5031cba7a4412f01eb774febfebf38087b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB44A 16116 bytes

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