Malicious PDF — malware analysis report

Static analysis result for SHA-256 20ca7b6fd4e0ea6d…

MALICIOUS

PDF

54.1 KB Created: 2020-08-08 07:26:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd50a060f0101358dbecf672b8be8749 SHA-1: 1bd146834ed5ecac5c54c6b0eea5d1be2a34cbbf SHA-256: 20ca7b6fd4e0ea6d41ed698da8834ccb0e03eedbf7d4d9c99258fe0110e22486
152 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a known malicious domain, ttraff.com, disguised as a search for 'bsc computer science 2st year books pdf'. This indicates a phishing or scam attempt. The document body, though heavily obfuscated, also contains the same URL, reinforcing the malicious intent. No scripts were extracted, but the PDF structure and embedded links are sufficient to identify the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=bsc+computer+science+2st+year+books+pdf
    • http://files.stalbanroe.org/uploads/1/3/0/9/130969708/rirobedo.pdf
    • http://files.irish-psychic.net/uploads/1/3/0/9/130969399/denovukexosukib.pdf
    • http://files.advanceadvocacyandsupport.com/uploads/1/3/1/4/131438459/3284279.pdf
    • https://cdn.shopify.com/s/files/1/0429/9443/4202/files/50637672223.pdf
    • https://cdn.shopify.com/s/files/1/0431/9353/2573/files/10271392631.pdf
    • https://cdn.shopify.com/s/files/1/0437/0323/8811/files/wuruzorozizud.pdf
    • https://cdn.shopify.com/s/files/1/0435/6797/2513/files/91611002442.pdf
    • https://cdn.shopify.com/s/files/1/0435/8720/7331/files/74452855894.pdf
    • https://cdn.shopify.com/s/files/1/0429/5265/5002/files/resuvom.pdf
    • https://cdn.shopify.com/s/files/1/0433/1945/9998/files/46484005481.pdf
    • https://cdn.shopify.com/s/files/1/0432/6300/0736/files/gumexulime.pdf
    • https://cdn.shopify.com/s/files/1/0451/4558/7877/files/breathe_on_me_breath_of_god_chords.pdf
    • https://cdn.shopify.com/s/files/1/0430/3876/9303/files/biography_of_lord_krishna.pdf
    • https://cdn.shopify.com/s/files/1/0428/9999/6839/files/dixamuvazubeliginuba.pdf
    • https://cdn.shopify.com/s/files/1/0429/1022/0447/files/b._com_syllabus_1st_year.pdf
    • https://cdn.shopify.com/s/files/1/0435/8311/1323/files/femapenadu.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006707.bin
18611405326df0f0ce9f96dbb07c3e52a81147a913fb5cdca3cc054ef1dc6459		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6707 5756 bytes
font_01_sfnt_off00007a94.bin
6eccce38622d4d4b722dbde0495d58de6550d1aa0d38ecaf99973f5005ed093b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A94 3204 bytes
font_02_sfnt_off00008785.bin
e18682b3fd46480e9666d503c4d562864582807b4e0cbc1ca2988c903de9febe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8785 2320 bytes
font_03_sfnt_off000091d7.bin
5f5c0f56d4d7bf65dd131a85c263e47ab5aa464c10d1319b7b43bc54d2996113		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91D7 10040 bytes
font_04_sfnt_off0000b42b.bin
c3f93d69e3cb30c81ae8f35965ac9f1a1a35941069675b7c0fcc3f03c8d11774		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB42B 16224 bytes

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