Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c8d052bffe51c82…

MALICIOUS

PDF

43.0 KB Created: 2020-08-22 13:40:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df0c69827aac04340802221f7f0c5039 SHA-1: 04febd05b54428b709e3ef251a68a51e27dd954d SHA-256: 4c8d052bffe51c8234dfd5f44a10973040476428fd6fa53fe47c51b005fcf5dc
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.cc/pify?keyword=best+antivirus+for+pc+free', is designed to lure users with a fake offer. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources, many hosted on Shopify. The ML classifier strongly supports the malicious nature of this PDF.

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=best+antivirus+for+pc+free
    • http://files.summerwindsmusic.com/uploads/1/3/1/4/131438439/vejadukimisigip.pdf
    • http://files.sclapparel.com/uploads/1/3/1/4/131437680/sepepiwujogot_dever_fulobe_mujezuf.pdf
    • http://files.assemblyrowoffices.com/uploads/1/3/2/6/132681209/rajexujorolutumabil.pdf
    • http://files.reusserland.com/uploads/1/3/0/8/130874189/zijubomumunisiwus.pdf
    • https://cdn.shopify.com/s/files/1/0433/9059/9319/files/fubezufodulomifipatuwola.pdf
    • https://cdn.shopify.com/s/files/1/0428/2292/6492/files/wordly_wise_3000_book_5_lesson_20.pdf
    • https://cdn.shopify.com/s/files/1/0437/6431/8359/files/tidojazaku.pdf
    • https://cdn.shopify.com/s/files/1/0431/4333/2000/files/37286171553.pdf
    • https://cdn.shopify.com/s/files/1/0434/1969/7303/files/oxymoron._examples_in_literature.pdf
    • https://cdn.shopify.com/s/files/1/0429/8548/8543/files/dudofuwumuvalirik.pdf
    • https://cdn.shopify.com/s/files/1/0432/1411/0880/files/sesatakogopisirumilok.pdf
    • https://cdn.shopify.com/s/files/1/0443/8884/3686/files/numeros_romanos_1_al_100.pdf
    • https://cdn.shopify.com/s/files/1/0447/2678/0060/files/shark_dichotomous_key_analysis_questions_answers.pdf
    • https://cdn.shopify.com/s/files/1/0428/6991/5814/files/xabiz.pdf
    • https://cdn.shopify.com/s/files/1/0428/4914/0902/files/28532470970.pdf
    • https://cdn.shopify.com/s/files/1/0428/9386/9223/files/sisitulegowelavojonaxiden.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_off00006adf.bin
63e95acbfdd2b77f3c932193727d3ee7d5b549c676d69e415c85ba3c5ac6cf0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6ADF 5084 bytes
font_01_sfnt_off00007c41.bin
57c72841c0dd4b521ab53a63975304fe915f3d6907aed0967a75208ddf62f4cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C41 10240 bytes

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