Malicious PDF — malware analysis report

Static analysis result for SHA-256 7788a079b7e80404…

MALICIOUS

PDF

33.6 KB Created: 2020-08-13 23:04:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: adab0a4e7b8ad1bebb6c91474424e5ba SHA-1: 3f35a6ed176577fa67cf75185f82893e46d6ec2f SHA-256: 7788a079b7e804045506270bcd32789f1588e9cab87bc9d152bdc0d5f370512b
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains, suggesting a link farm or SEO poisoning attempt. One of the primary links directs to a known malicious redirector, indicating a malicious intent to lead the user to harmful content. 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.ru/wb?keyword=lenze%20smd%20frequency%20inverter%20manual
    • http://files.seattleatlasdoc.com/uploads/1/3/1/6/131637147/jizinedumerexu-wovon.pdf
    • http://files.kurik9massage.com/uploads/1/3/0/9/130970004/suralu.pdf
    • http://files.youngsupholstery.com/uploads/1/3/2/7/132712282/vizutulonaj.pdf
    • http://wabojam.svbarnquilts.org/uploads/1/3/0/7/130776394/depixavilaxa_ridozasono_jeromikaxo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/9609/5397/files/peter_drucker_libros.pdf
    • https://cdn.shopify.com/s/files/1/0432/2492/4319/files/39957756850.pdf
    • https://cdn.shopify.com/s/files/1/0438/0835/8561/files/gladiators_weapon_crossword_clue.pdf
    • https://cdn.shopify.com/s/files/1/0429/0471/5427/files/12190088287.pdf
    • https://cdn.shopify.com/s/files/1/0431/0679/5686/files/geriv.pdf
    • https://cdn.shopify.com/s/files/1/0432/4943/4792/files/88051497189.pdf
    • https://cdn.shopify.com/s/files/1/0434/7396/1125/files/canif_autosar.pdf
    • https://cdn.shopify.com/s/files/1/0437/3151/7592/files/pofabipezivejusozedokuw.pdf
    • https://cdn.shopify.com/s/files/1/0429/1143/2857/files/tewodurakasavax.pdf
    • https://cdn.shopify.com/s/files/1/0432/8092/4837/files/64048517183.pdf
    • https://cdn.shopify.com/s/files/1/0431/6889/1040/files/case_study_philippines.pdf
    • https://cdn.shopify.com/s/files/1/0427/4877/2508/files/zigepe.pdf
    • https://cdn.shopify.com/s/files/1/0433/9056/6556/files/how_to_electronically_sign_a_on_ipad.pdf
    • https://cdn.shopify.com/s/files/1/0434/6275/4461/files/zepujuxaroriwudetevirot.pdf
    • https://cdn.shopify.com/s/files/1/0431/1482/3844/files/atmega16a_datasheet_download.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000048ad.bin
3a21c93fcbb4ccb3ac523701d7aba15b46fa2bdcbe44d4805bc415a4667ddc9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x48AD 5448 bytes
font_01_sfnt_off00005b2a.bin
92e9490f5bf9d86c7460e816ac8b675074c773b130e7ae6a312b687bd71eec8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B2A 8832 bytes

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