Malicious PDF — malware analysis report

Static analysis result for SHA-256 c92777cf02b59fcf…

MALICIOUS

PDF

36.3 KB Created: 2020-08-08 21:59:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0e771246e472ce987cdee42c1319e59 SHA-1: cc74db9dc0a19d2817cccb24da596c85ffdd6b77 SHA-256: c92777cf02b59fcfe3f2d8b4e8abc9757b6b93e304ba0a9e28db11e1ce1ded96
152 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, which points to `https://ttraff.cc/pify?keyword=oxford+elementary+learner+s+dictionary+english+english+persian+pdf`. This URL is likely part of a phishing or scam campaign, attempting to trick users into downloading further malicious content or visiting compromised sites. The presence of numerous other links to PDF files hosted on various domains, many of which are unknown or potentially malicious, further supports this assessment.

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=oxford+elementary+learner+s+dictionary+english+english+persian+pdf
    • http://files.saikmusic.org/uploads/1/3/2/7/132740415/67c8893d65fe7.pdf
    • http://files.dpcoachingcentre.com/uploads/1/3/0/8/130874039/95ecc32.pdf
    • http://files.avanseansanm.org/uploads/1/3/0/8/130814728/719520.pdf
    • http://kopozifom.rickspubandgrill.com/uploads/1/3/2/6/132681352/xusadowir.pdf
    • https://cdn.shopify.com/s/files/1/0431/6394/3067/files/69151526001.pdf
    • https://cdn.shopify.com/s/files/1/0432/0677/0849/files/the_anesthesia_technician_and_technologists_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/6059/1776/files/22339635188.pdf
    • https://cdn.shopify.com/s/files/1/0428/0002/1667/files/57610377087.pdf
    • https://cdn.shopify.com/s/files/1/0434/4745/1798/files/o_que__anemia_ferropriva.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/63908687591.pdf
    • https://cdn.shopify.com/s/files/1/0431/4896/8090/files/fenefonixopupawomid.pdf
    • https://cdn.shopify.com/s/files/1/0430/4479/8613/files/1229255838.pdf
    • https://cdn.shopify.com/s/files/1/0431/9641/6157/files/les_animaux_fantastiques_livre.pdf
    • https://cdn.shopify.com/s/files/1/0431/6902/2109/files/jakalokakagiz.pdf
    • https://cdn.shopify.com/s/files/1/0435/1488/8360/files/aula_internacional_1_student_s_book_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/3731/9590/files/16065962359.pdf
    • https://cdn.shopify.com/s/files/1/0428/1624/1831/files/fupewasiteguvaloset.pdf
    • https://cdn.shopify.com/s/files/1/0431/5863/4658/files/4762561614.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_off00004e26.bin
a671fc89a7d8d639a3da135ca4bd897de0655d213c611839bfaeed479c64feea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E26 5764 bytes
font_01_sfnt_off000061ab.bin
3381f20d665b8e9d21cfe652f296aaeb4cd0242b5db74cfe2e501c09e067a727		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61AB 10164 bytes

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