Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0436bcd27acde2c…

MALICIOUS

PDF

37.9 KB Created: 2020-08-21 02:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d18e058da0ed045e7f41ec64995becbc SHA-1: 79ea597817ac58f90d5f1f2f2eb83b84379ef8db SHA-256: b0436bcd27acde2c378939689525ce1e112ab36e6853e8bf90c89671063d2d75
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1204.002 Malicious File: Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits a PDF SEO link farm, embedding numerous external PDF links, many hosted on Shopify. The ML classifier also strongly flagged this PDF as malicious. The primary intent appears to be redirecting users to malicious infrastructure, potentially for phishing or malware distribution.

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=cutter+guide+en+francais
    • http://nafopu.scholasticlead.com/uploads/1/3/0/7/130775403/2e190.pdf
    • http://files.divorcecoachingandconsulting.com/uploads/1/3/0/8/130874518/bejam-soselovorifat-tekumubobup-powidonuvewadar.pdf
    • http://files.exquisiteair-water.com/uploads/1/3/0/7/130776027/0754f7ad9deb584.pdf
    • http://xalin.robkajiwara.com/uploads/1/3/1/3/131383483/jolazijinibadinedegu.pdf
    • http://files.stjosephwestphalia.org/uploads/1/3/0/7/130775724/3360978.pdf
    • https://cdn.shopify.com/s/files/1/0435/1462/6202/files/wefasadatidoduw.pdf
    • https://cdn.shopify.com/s/files/1/0431/1754/3588/files/wetuwulurisusifeso.pdf
    • https://cdn.shopify.com/s/files/1/0429/3204/3943/files/pixasudixarox.pdf
    • https://cdn.shopify.com/s/files/1/0437/3594/1274/files/cxc_chemistry_past_papers_multiple_choice.pdf
    • https://cdn.shopify.com/s/files/1/0430/1966/5561/files/87901517890.pdf
    • https://cdn.shopify.com/s/files/1/0427/4513/5260/files/fejodidurudenudekedufixe.pdf
    • https://cdn.shopify.com/s/files/1/0428/3550/9415/files/adobe_acrobat_reader_dc_in_word_umwandeln.pdf
    • https://cdn.shopify.com/s/files/1/0431/7318/3643/files/converting_to_word_without_adobe.pdf
    • https://cdn.shopify.com/s/files/1/0434/8660/9573/files/pikiw.pdf
    • https://cdn.shopify.com/s/files/1/0431/3248/5793/files/benders_decomposition.pdf
    • https://cdn.shopify.com/s/files/1/0430/7753/3856/files/topographical_anatomy_of_man.pdf
    • https://cdn.shopify.com/s/files/1/0434/7753/2824/files/duxitip.pdf
    • https://cdn.shopify.com/s/files/1/0431/8406/2622/files/47464778661.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_off00005855.bin
2c7effe9a2e2003f314c6a4f58fdd25ca43013e109b87e59822910b39233819e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5855 5064 bytes
font_01_sfnt_off0000699e.bin
759087f926aabcbd1d7e39ec8ed45d3c5ef70fd6e892dca7222ed76ae691d4ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x699E 9684 bytes

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