Malicious PDF — malware analysis report

Static analysis result for SHA-256 054cccdb9acf8a49…

MALICIOUS

PDF

41.8 KB Created: 2020-08-15 23:19:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3360125d315aad0b8b2e531a623461f1 SHA-1: f94bd33ae8ad2eea2abab51b81d732a782d737e4 SHA-256: 054cccdb9acf8a49b45a782d4d740ee1855042e737e348adc9427931f9516a05
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external sites, classifying it as a link farm. One of the primary links, 'https://ttraff.cc/wb?keyword=adjective%20and%20adverb%20printable%20worksheets', is identified as a malicious redirector. The document's structure and content suggest an attempt to lure users to potentially malicious or unwanted websites under the guise of providing educational resources.

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/wb?keyword=adjective%20and%20adverb%20printable%20worksheets
    • http://wapew.direwolfomega.net/uploads/1/3/1/4/131409090/5781b.pdf
    • http://files.desmoinesmarina.com/uploads/1/3/1/3/131381553/630c62.pdf
    • http://files.rooseveltelementarypto.org/uploads/1/3/1/8/131857914/569dd39a6f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/9963/4328/files/49440945453.pdf
    • https://cdn.shopify.com/s/files/1/0430/6835/8807/files/9779907641.pdf
    • https://cdn.shopify.com/s/files/1/0431/4667/4336/files/23342005412.pdf
    • https://cdn.shopify.com/s/files/1/0429/2381/9164/files/wapub.pdf
    • https://cdn.shopify.com/s/files/1/0437/0569/6407/files/theory_of_harmony_arnold_schoenberg.pdf
    • https://cdn.shopify.com/s/files/1/0430/9005/1221/files/ceremony_leslie_marmon_silko_full.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gomejalubewetilukifij.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006168.bin
e69604f78f6d6cae57005dca6d691098e6698c3538ab621436c4e0534dbaef2c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6168 5580 bytes
font_01_sfnt_off00007465.bin
c576240b34d1f6e857951752247e939e22c79467d74b8791facf9ec73f9d2288
pdf-font-stream PDF embedded font (sfnt) at offset 0x7465 10540 bytes