Malicious PDF — malware analysis report

Static analysis result for SHA-256 21f71e3ddb3baec0…

MALICIOUS

PDF

38.9 KB Created: 2020-08-15 08:32:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f48427da419ba9d4c1b8586fb8f90b9f SHA-1: 39fe8c22d55b6e3d5dd525ec237f2139d8016311 SHA-256: 21f71e3ddb3baec000779fa5e715715552c7c363ba12127faeafbfa095717868
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector pointing to 'https://ttraff.com/pify?keyword=sistem+informasi+akuntansi+menurut+para+ahli+terbaru'. The document also features a link farm strategy, embedding 17 external PDF links, many hosted on Shopify, to potentially obscure malicious activity. The ML classifier 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.com/pify?keyword=sistem+informasi+akuntansi+menurut+para+ahli+terbaru
    • http://diwezoza.pirumanors.com/uploads/1/3/1/3/131384778/8241511.pdf
    • http://files.tulsayogameditationcenter.com/uploads/1/3/1/3/131382982/wujezezaz.pdf
    • http://files.countyparkfriends.org/uploads/1/3/0/8/130814279/zobisulit_selitiga_sojinotavom.pdf
    • http://files.syedarahman.com/uploads/1/3/1/4/131408798/7369853.pdf
    • http://files.rudymareelphotography.com/uploads/1/3/1/4/131408465/018d6ca1118cc3b.pdf
    • https://cdn.shopify.com/s/files/1/0437/1021/8391/files/lovatts_crosswords_and_puzzles_answers.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/69892687871.pdf
    • https://cdn.shopify.com/s/files/1/0434/6943/9141/files/rifitamuparosovob.pdf
    • https://cdn.shopify.com/s/files/1/0431/8635/6375/files/45290104616.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dijovosulodomozov.pdf
    • https://cdn.shopify.com/s/files/1/0429/6006/0567/files/nuzoladelakojireputaxadu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7439/6058/files/zuzegovogunira.pdf
    • https://cdn.shopify.com/s/files/1/0428/4622/4551/files/bring_down_the_house_book.pdf
    • https://cdn.shopify.com/s/files/1/0433/6992/2714/files/33909203013.pdf
    • https://cdn.shopify.com/s/files/1/0438/7579/5099/files/36240350127.pdf
    • https://cdn.shopify.com/s/files/1/0448/1040/4000/files/assembler_directives_of_8085.pdf
    • https://cdn.shopify.com/s/files/1/0435/9412/1379/files/fekiligajopeve.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_off00005982.bin
bf8a50267dada92d91bf2a4b3534e173cb9b55e566a7adbefea94b7f111ad331		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5982 5448 bytes
font_01_sfnt_off00006bd6.bin
7ee6ee0e7bd49cfa5502651704643a175f8ef38e8ef52c127cbfca4372d5f1bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BD6 10132 bytes

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