Malicious PDF — malware analysis report

Static analysis result for SHA-256 b639fd212916be81…

MALICIOUS

PDF

42.5 KB Created: 2020-08-14 23:10:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3882ae38f13d7423998c39ddc70b509a SHA-1: d16cfc06f35839c21507646320c0b716e54ab6c2 SHA-256: b639fd212916be81bec785f1d675dc7f327a5344ca8736b8e8a9e5d32b29df06
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a critical redirector link to 'ttraff.cc', indicating a phishing or malware distribution attempt. The document body, though partially corrupted, suggests a lure related to 'figurative language worksheets fourth grade'. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful sites.

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=figurative+language+worksheets+fourth+grade
    • http://sexijaku.allonanny.com/uploads/1/3/2/6/132681947/xomexibunulof.pdf
    • http://files.lucerneinternationalfilmfestival.com/uploads/1/3/0/7/130738806/misapamefikaga-wilimegepab.pdf
    • http://pewir.roofingnorthtexas.com/uploads/1/3/2/6/132680903/fbd467e3fcebff.pdf
    • http://files.artsybeedigital.com/uploads/1/3/2/3/132302710/jobulowejotebewe.pdf
    • http://luvakix.chaoticremains.com/uploads/1/3/0/8/130813420/5339ce42b.pdf
    • https://cdn.shopify.com/s/files/1/0430/9866/9220/files/79219513008.pdf
    • https://cdn.shopify.com/s/files/1/0432/0067/5995/files/jumekusa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/porovurujapiganipuzul.pdf
    • https://cdn.shopify.com/s/files/1/0432/3062/5950/files/xebitipexug.pdf
    • https://cdn.shopify.com/s/files/1/0430/7730/4484/files/firevitizagikigibuj.pdf
    • https://cdn.shopify.com/s/files/1/0433/7532/9441/files/marine_boilers_third_edition.pdf
    • https://cdn.shopify.com/s/files/1/0433/2273/6798/files/59648267786.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_off000067d9.bin
f141be2bffbd23bbab83338121f762982292731fe7c4bfb1cad2d59336c603db
pdf-font-stream PDF embedded font (sfnt) at offset 0x67D9 5340 bytes
font_01_sfnt_off00007a16.bin
f44cb4bcf5b33bc7e91b943385ece5907617a7deb1a587dd2a31d6e347b33f5a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A16 10368 bytes