Malicious PDF — malware analysis report

Static analysis result for SHA-256 55f5c5c265b4ae2e…

MALICIOUS

PDF

48.5 KB Created: 2020-08-13 22:41:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c51805f64fd32f363a71724966e7b1c6 SHA-1: 83453b2b2442fdf71473f331d2394b2d9775ed23 SHA-256: 55f5c5c265b4ae2ec8a1b596c4fde773fcb5806e8e7b78ed96c0d35f47773603
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is likely used to obscure the final malicious destination. The document also hosts a large number of external PDF links, many pointing to Shopify domains, suggesting a link farm or SEO poisoning tactic to attract victims. No scripts were extracted, but the presence of the malicious redirector and the link farm strongly indicate a phishing or scam attempt.

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.cc/pify?keyword=market+leader+business+english+human+resources+pdf
    • http://files.robertkirklandconsulting.com/uploads/1/3/2/6/132681378/repigi_damomijijujozaf_loduxuwabala_lefusovoladeg.pdf
    • http://files.mackenzywatsonsportfolio.com/uploads/1/3/2/7/132740804/puwizubewogila-devag-nuzumarirak-repowunevifi.pdf
    • http://files.studybuddyasia.com/uploads/1/3/1/4/131455621/walujasa_rekumoj_sitirezerez.pdf
    • http://files.marcio.ankarfeldt.com/uploads/1/3/1/3/131383934/3078782.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nakawefefaf.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/78108387577.pdf
    • https://cdn.shopify.com/s/files/1/0430/7795/9833/files/84436816753.pdf
    • https://cdn.shopify.com/s/files/1/0434/4964/7270/files/27753859158.pdf
    • https://cdn.shopify.com/s/files/1/0439/0954/6136/files/39267465256.pdf
    • https://cdn.shopify.com/s/files/1/0439/4038/0840/files/tulsian_accountancy_class_12.pdf
    • https://cdn.shopify.com/s/files/1/0431/6938/2557/files/litobo.pdf
    • https://cdn.shopify.com/s/files/1/0434/9231/1206/files/25723758975.pdf
    • https://cdn.shopify.com/s/files/1/0440/3747/2421/files/6393294139.pdf
    • https://cdn.shopify.com/s/files/1/0433/5573/4166/files/fufufekafafozopuk.pdf
    • https://cdn.shopify.com/s/files/1/0431/1298/8821/files/mowozutonulip.pdf
    • https://cdn.shopify.com/s/files/1/0432/5592/2852/files/boxosunipipogurova.pdf
    • https://cdn.shopify.com/s/files/1/0434/4053/7750/files/smiley_face_symbols_copy_and_paste.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_off00006e5a.bin
0a9740d7f3764c5cc1ae9161b0c263ebccac18cd3e560daba916b88b47adb8ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E5A 5660 bytes
font_01_sfnt_off00008163.bin
814e19c3b4da69e8dac231b2ce122ec9f4871d6f4aae627d9f36c0ffaf075d13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8163 10888 bytes
font_02_sfnt_off0000a681.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA681 4324 bytes

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