Malicious PDF — malware analysis report

Static analysis result for SHA-256 a61f03d88ac67da6…

MALICIOUS

PDF

41.2 KB Created: 2020-08-13 22:24:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a63c431a156732dc5c7b14fb2ea30ed SHA-1: b7e28af6e1c2f92768ea0d6c710b80f7d09ee009 SHA-256: a61f03d88ac67da6d186d76fef2c93810e63dbe07939dcaddfbbac57e275abd5
152 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by an ML classifier and contains a critical heuristic indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=twinkle+twinkle+little+star+mozart+pdf', which is also listed as a malicious redirector. Additionally, a large number of external PDF links were found, many hosted on shopify.com, suggesting a link farm or distribution mechanism.

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=twinkle+twinkle+little+star+mozart+pdf
    • http://files.kitlotus.org/uploads/1/3/0/7/130739544/9876718.pdf
    • http://files.encircledbirth.com/uploads/1/3/0/7/130739021/kejiban-nirizopadaso-dinigabiripinok.pdf
    • http://files.hiddenroadinitiative.org/uploads/1/3/1/8/131872178/8f1532852.pdf
    • http://numadavo.gaprx340b.com/uploads/1/3/0/8/130814674/pusefujejuvabe-nalokaz-xabefojovibumuj.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/biludetejuvujatolometa.pdf
    • https://cdn.shopify.com/s/files/1/0431/6066/6274/files/rawiwa.pdf
    • https://cdn.shopify.com/s/files/1/0430/1537/2949/files/rudutiwinawubuko.pdf
    • https://cdn.shopify.com/s/files/1/0434/1684/6488/files/16445171452.pdf
    • https://cdn.shopify.com/s/files/1/0440/7368/1061/files/catering_menu_panera.pdf
    • https://cdn.shopify.com/s/files/1/0437/8555/2030/files/que_es_el_biomagnetismo.pdf
    • https://cdn.shopify.com/s/files/1/0429/7791/9129/files/liruzifisaseso.pdf
    • https://cdn.shopify.com/s/files/1/0434/6282/0005/files/introduction_to_mastering_physics_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/0797/5335/files/85683889082.pdf
    • https://cdn.shopify.com/s/files/1/0434/0016/7589/files/guwujuxiremiliz.pdf
    • https://cdn.shopify.com/s/files/1/0431/5955/2155/files/fopafogofogurokuji.pdf
    • https://cdn.shopify.com/s/files/1/0428/2315/5878/files/comment_calculer_la_tva_au_maroc.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_off000062f9.bin
e9e08e8b4c256059fe42e123212d3655d443707a2e0e78cc1c02750895b5e526		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62F9 5340 bytes
font_01_sfnt_off00007529.bin
b46aece13399625cb5f0f21bc624eae0f16f27eb7f9a3dbbe8cbc623b32e9e56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7529 10088 bytes

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