Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad68de2a4b643bcd…

MALICIOUS

PDF

39.0 KB Created: 2020-08-24 14:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fbc600e30eeae3ec44bb00d1ccf04d50 SHA-1: 34fb49c5fff3cfcd43797c5eba45782d9999af26 SHA-256: ad68de2a4b643bcd9bacebaacca07b8f26ff1a8476eea33600a4fc9dac4aad68
152 Risk Score

Malware Insights

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

The PDF contains a link farm and a redirector to malicious infrastructure, disguised as IELTS preparation material. The primary malicious URL is https://ttraff.com/pify?keyword=ielts+speaking+introduction+questions+and+answers. The document body is heavily obfuscated, but the presence of the malicious link and the heuristic firings strongly indicate a phishing or redirection attack. No scripts were extracted from this sample.

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=ielts+speaking+introduction+questions+and+answers
    • http://kogesesu.lisabaudry.com/uploads/1/3/0/9/130968973/vodugewev.pdf
    • https://cdn.shopify.com/s/files/1/0431/2724/2914/files/duwogunazumiro.pdf
    • https://cdn.shopify.com/s/files/1/0432/2358/0830/files/53764730929.pdf
    • https://cdn.shopify.com/s/files/1/0433/9207/3895/files/notepad_plugins_manager.pdf
    • https://cdn.shopify.com/s/files/1/0434/0491/8941/files/bob_anderson_stretching.pdf
    • https://cdn.shopify.com/s/files/1/0428/3957/2643/files/bakliwal_entrance_exam_papers.pdf
    • https://cdn.shopify.com/s/files/1/0432/2807/0052/files/71977348814.pdf
    • https://cdn.shopify.com/s/files/1/0432/5117/1478/files/95692594622.pdf
    • https://cdn.shopify.com/s/files/1/0431/4464/2715/files/jupunurejanewod.pdf
    • https://cdn.shopify.com/s/files/1/0435/2039/3375/files/34211347522.pdf
    • https://cdn.shopify.com/s/files/1/0432/9734/1604/files/6978956340.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_off00005c1f.bin
038e9809225e3b35c8646814449317b8bdf993e0fb0354a0f16ec42303454697		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C1F 5460 bytes
font_01_sfnt_off00006ebf.bin
d708c9e20e827c08aea05b1805971f230e17f292203288cca96880f04e6189f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EBF 9500 bytes

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