Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1c3361cf11026a8…

MALICIOUS

PDF

55.0 KB Created: 2020-08-14 05:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16c44a6318be51144d70734ba87a4a35 SHA-1: 970582788ed4ef715dd0bb7fda8c229082672c38 SHA-256: d1c3361cf11026a8de1efa421d69069f1dd93a18b20d415267fe45572686c419
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to suspicious or unknown domains, indicating a link farm or redirector strategy. The primary malicious URL identified is https://ttraff.ru/pify?keyword=cadera+y+pelvis+anatomia+pdf, which is flagged as a known malicious redirector. The document body, though heavily obfuscated, also contains this URL and several other Shopify-hosted PDF links, suggesting an attempt to disguise malicious activity within a large collection of seemingly benign content. 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.ru/pify?keyword=cadera+y+pelvis+anatomia+pdf
    • http://pepabomet.peacepantry.org/uploads/1/3/1/1/131164250/56156c43a.pdf
    • http://files.equineassistedtherapyofnj.org/uploads/1/3/1/3/131380337/rusivuxose.pdf
    • http://fabagif.harrypottervet.com/uploads/1/3/1/4/131482975/bda37e4.pdf
    • https://cdn.shopify.com/s/files/1/0433/2729/1547/files/homogeneous_and_heterogeneous_mixtures_examples.pdf
    • https://cdn.shopify.com/s/files/1/0432/0873/6928/files/46877788814.pdf
    • https://cdn.shopify.com/s/files/1/0433/1618/3205/files/77190491867.pdf
    • https://cdn.shopify.com/s/files/1/0430/9463/8749/files/kipesupeminoxakafomubaje.pdf
    • https://cdn.shopify.com/s/files/1/0455/7688/0293/files/basic_grammar_in_use_test.pdf
    • https://cdn.shopify.com/s/files/1/0432/0077/4307/files/spiderman_on_pc.pdf
    • https://cdn.shopify.com/s/files/1/0433/2604/6362/files/vigojepe.pdf
    • https://cdn.shopify.com/s/files/1/0439/4424/7451/files/open_bittorrent_tracker.pdf
    • https://cdn.shopify.com/s/files/1/0435/2580/0087/files/widebo.pdf
    • https://cdn.shopify.com/s/files/1/0437/9770/8957/files/95508092466.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/75320426607.pdf
    • https://cdn.shopify.com/s/files/1/0441/0625/2440/files/gejitib.pdf
    • https://cdn.shopify.com/s/files/1/0429/3941/6732/files/votixuwut.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000887d.bin
90cc48341e78d68a5f4908e204a26be057c4947f45a7e7c9334d1a17e5c87bbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x887D 5160 bytes
font_01_sfnt_off000099fd.bin
7ca9ebee6cb28ac619defe4be60b69c9e0237ea156904613b09f114ba81f868d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99FD 11372 bytes
font_02_sfnt_off0000bf1c.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF1C 4324 bytes

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