Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa10ca7d7a53ad6a…

MALICIOUS

PDF

34.2 KB Created: 2020-08-22 13:58:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e427d3ef31dc2dc49899da21c3842e97 SHA-1: cbf127a0c8f1791ce8cc7c8372ef241fb95d77c0 SHA-256: aa10ca7d7a53ad6afe55e9bdb1136fd93ab3be56d6b9b228c667a430cce743cb
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=adiemus+sheet+music+free' which is flagged as malicious. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute malicious content. No scripts were extracted, but the primary attack vector appears to be the redirection to external malicious sites.

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=adiemus+sheet+music+free
    • http://murud.mammamaniaabbatribute.com/uploads/1/3/1/6/131637395/lowozosun-vikawidezuji-rizarizituwube-kaxoxibexigo.pdf
    • http://files.brecksvillecogop.org/uploads/1/3/0/7/130739275/8609829.pdf
    • http://files.thelittletheatreindia.com/uploads/1/3/1/6/131637306/kilinumekebibi-gewelu-liwizenu-pexesipopuzozud.pdf
    • http://files.mushtaraka.net/uploads/1/3/2/8/132814220/favananegoleka.pdf
    • https://cdn.shopify.com/s/files/1/0427/5005/0460/files/radevilonapura.pdf
    • https://cdn.shopify.com/s/files/1/0438/0511/4528/files/12789541466.pdf
    • https://cdn.shopify.com/s/files/1/0435/8658/4733/files/wisojuzipojapif.pdf
    • https://cdn.shopify.com/s/files/1/0431/4071/0566/files/73826619403.pdf
    • https://cdn.shopify.com/s/files/1/0440/6296/5912/files/49673604138.pdf
    • https://cdn.shopify.com/s/files/1/0439/6243/3694/files/adding_fractions_with_different_denominator_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0441/0372/9304/files/win_7_ultimate_32_bit_sp1.pdf
    • https://cdn.shopify.com/s/files/1/0430/5027/0869/files/1134921191.pdf
    • https://cdn.shopify.com/s/files/1/0428/0814/8127/files/xeniwivunofuvuvamexolu.pdf
    • https://cdn.shopify.com/s/files/1/0440/2987/0230/files/32959058014.pdf
    • https://cdn.shopify.com/s/files/1/0432/7673/0533/files/fletcher_henderson_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0437/9148/3031/files/adventitious_breath_sounds.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_off000049e7.bin
c54c1fddc64e6de46df3c7859ad7d9e86d456a831f0bb7564466649b3ff5a4bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x49E7 5008 bytes
font_01_sfnt_off00005ac9.bin
3432c663310378f4d73633b3650ee5ee84d786fd5a092a515424327ae39dc8da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AC9 9692 bytes

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