Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bcd1cef0f7eed4b…

MALICIOUS

PDF

54.8 KB Created: 2020-09-07 14:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb59f6e477758a0fe43002d765b7099d SHA-1: 51357a6ed186254e8ff5784d8e163576e77a5702 SHA-256: 5bcd1cef0f7eed4b249677d99807a281785bb50ea1fb58e34dcd1d8b55e2de94
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a redirector service, which is a common tactic for phishing and malware distribution. The document body, though heavily obfuscated, contains text related to an 'adverbs of place worksheet grade 2' and the malicious URL, suggesting a lure to trick users into clicking the link. The presence of numerous external PDF links further indicates a link farm or SEO manipulation tactic.

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.link/wix?keyword=adverbs+of+place+worksheet+grade+2
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/7910/6724/files/kafonunujek.pdf
    • https://cdn.shopify.com/s/files/1/0431/5627/5362/files/93208443910.pdf
    • https://cdn.shopify.com/s/files/1/0429/5458/8316/files/58355755183.pdf
    • https://cdn.shopify.com/s/files/1/0432/3731/0626/files/best_luxury_suv_2018_consumer_reports.pdf
    • https://static.usrfiles.com/ugd/4d400c_f14efad8b52a431eb5dadbd53493bdd4.pdf
    • https://static.usrfiles.com/ugd/738632_d2de388131c7450eac1a01d227bc3a3c.pdf
    • https://static.usrfiles.com/ugd/bdeb4c_0ad4432a92fc469a91a2a8c2447e2f64.pdf
    • https://static.usrfiles.com/ugd/599026_5a39d7379cc44536834c691e776950e6.pdf
    • https://static.usrfiles.com/ugd/191a6d_a6241349a79148009bfed26407770678.pdf
    • https://cdn.shopify.com/s/files/1/0434/2058/2050/files/apologize_one_republic_partition_piano.pdf
    • https://cdn.shopify.com/s/files/1/0431/8317/7887/files/limalanugobewejuzisitug.pdf
    • https://cdn.shopify.com/s/files/1/0435/7505/0395/files/natural_remedies_for_bartholin_abscess.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000089ba.bin
bd9f7a71b5ac2d96cd99d416ac416902517f2823bcc238c6b30aa4c3d82a798e
pdf-font-stream PDF embedded font (sfnt) at offset 0x89BA 5528 bytes
font_01_sfnt_off00009cb0.bin
6571956f6368d19c6b761ccb35f7a9077708d25ed86eb6a3766e16c5c4903676
pdf-font-stream PDF embedded font (sfnt) at offset 0x9CB0 10336 bytes
font_02_sfnt_off0000bfe6.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230
pdf-font-stream PDF embedded font (sfnt) at offset 0xBFE6 4324 bytes