Malicious PDF — malware analysis report

Static analysis result for SHA-256 0757bf99b265aa65…

MALICIOUS

PDF

46.5 KB Created: 2020-07-28 02:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3411f301e60a7d35f2f4d9daa282dc56 SHA-1: de2eccebbf7ab2c7febe1d95db629d020d48abe0 SHA-256: 0757bf99b265aa656cf75e645069415739cc0ab90755b38f4aa3ebe4c8c237cc
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'ttraff.cc'. It also exhibits a PDF link farm heuristic, indicating a large number of outbound links, many of which are to Shopify domains hosting other PDFs. The ML classifier strongly flagged this PDF as malicious. The presence of embedded URLs and the overall structure suggest an attempt to direct users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=3+moonu+ringtones+love+bgm
    • http://files.robincheers.com/uploads/1/3/0/9/130969322/kajuwiriraj_powarereweba_fujin.pdf
    • http://files.stevendorscher.com/uploads/1/3/2/7/132740905/6999150.pdf
    • http://files.oscfc.org/uploads/1/3/0/8/130814235/bedafixunigin_fowile.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/6090/4604/files/56875260968.pdf
    • https://cdn.shopify.com/s/files/1/0437/8574/8642/files/sofepurev.pdf
    • https://cdn.shopify.com/s/files/1/0428/0041/4883/files/kalobobazivemexo.pdf
    • https://cdn.shopify.com/s/files/1/0437/9269/5458/files/vaxefodozenel.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/semigo.pdf
    • https://cdn.shopify.com/s/files/1/0436/5543/0309/files/48361378200.pdf
    • https://cdn.shopify.com/s/files/1/0429/4384/0412/files/75243820774.pdf
    • https://cdn.shopify.com/s/files/1/0433/7883/5606/files/19960401125.pdf
    • https://cdn.shopify.com/s/files/1/0430/7173/3917/files/betuki.pdf
    • https://cdn.shopify.com/s/files/1/0432/8790/4411/files/56491237681.pdf
    • https://cdn.shopify.com/s/files/1/0430/9558/9013/files/wibowimepazeviwapido.pdf
    • https://cdn.shopify.com/s/files/1/0430/1740/4573/files/49133996835.pdf
    • https://cdn.shopify.com/s/files/1/0430/9752/2329/files/xinivaxesiwuw.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005845.bin
b9b90113733981231d4e2668104a7e79596d9a0e53d4d5abee8f02f5390c56cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5845 4948 bytes
font_01_sfnt_off000068f9.bin
4b901072185e861046be14276314799fe0156b4acaf079a2b5b99d0a2912b5f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68F9 4144 bytes
font_02_sfnt_off000075ae.bin
562fc1fe868e4e70176e130caa56f261f4685f7a5bb287012ae674046f9ac9ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75AE 9748 bytes
font_03_sfnt_off00009754.bin
e296a61d2d303e35be9e1a35631556663d2780498efa7e8f3867bf557f172fe6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9754 16164 bytes

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