Malicious PDF — malware analysis report

Static analysis result for SHA-256 039d073c87c2e49d…

MALICIOUS

PDF

53.5 KB Created: 2020-08-17 16:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a058524416b5b3d57c3288069eb8955 SHA-1: ee8af03fb61243b3ae63f47c04e228461fd7b92c SHA-256: 039d073c87c2e49df22103dc8c090cef6e0d54ccd7020fe04bbaab409d15d9dd
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one heuristic specifically identifying a link to known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=akoam+apk+android'. The document body, though heavily obfuscated, also contains this URL and other Shopify links, suggesting a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful content.

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=akoam+apk+android
    • http://files.fbcpc.us/uploads/1/3/0/7/130740508/vugezinuba.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/9367/2604/files/bengali_books_free_download_site.pdf
    • https://cdn.shopify.com/s/files/1/0429/6127/2983/files/7252272360.pdf
    • https://cdn.shopify.com/s/files/1/0435/3189/4944/files/lijedot.pdf
    • https://cdn.shopify.com/s/files/1/0430/3106/8823/files/45359838522.pdf
    • https://cdn.shopify.com/s/files/1/0428/8148/2919/files/prodigy_hacks_2019.pdf
    • https://cdn.shopify.com/s/files/1/0432/8862/5316/files/lightup_full_version_installation.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99231100330.pdf
    • https://cdn.shopify.com/s/files/1/0427/4854/3142/files/44053673781.pdf
    • https://cdn.shopify.com/s/files/1/0439/9045/0334/files/34159272047.pdf
    • https://cdn.shopify.com/s/files/1/0432/8534/8510/files/86142195354.pdf
    • https://cdn.shopify.com/s/files/1/0431/0630/4162/files/semilubovox.pdf
    • https://cdn.shopify.com/s/files/1/0429/5265/5004/files/casual_vacancy_book.pdf
    • https://cdn.shopify.com/s/files/1/0429/6772/8281/files/xulobipodujonase.pdf
    • https://cdn.shopify.com/s/files/1/0428/8049/9879/files/54413479271.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00008c16.bin
02a143f86bcca3bf4b01099a3b780f755b588e96b24c5faa85a90806a6ed536c		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8C16 25832 bytes
font_00_sfnt_off000058a9.bin
8a1aefaedbe5621243e416cbee21523a9106ed87c395947dd3bb28d5c278c85a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58A9 4540 bytes
font_01_sfnt_off000067dc.bin
ad62cd99758242b3d80093d3fda318764983889995a2a93403559a51491e17fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67DC 10508 bytes
font_03_sfnt_off0000b942.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB942 4324 bytes

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