Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc58f8e1c9991661…

MALICIOUS

PDF

34.2 KB Created: 2020-08-14 17:08:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 101b9f9fe2c0c26ece2e4005569df903 SHA-1: 3c2347317a2fe98de8a12604f691a91b05d6be48 SHA-256: dc58f8e1c99916611a3470d505fa3304ac7e1849467074c90b1a63fe685f8956
152 Risk Score

Malware Insights

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

The PDF contains a link farm and a direct link to a known malicious redirector, ttraff.cc. The document body, though heavily obfuscated, contains the text 'Guild wars 2 crafting guide for beginners' and the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves redirecting users to malicious infrastructure via a social engineering lure.

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=guild+wars+2+crafting+guide+for+beginners
    • http://files.dopekonect.net/uploads/1/3/0/7/130775292/poxapusulupol_surafijak_jatodip.pdf
    • http://voxitaj.bhbrilliantminds.org/uploads/1/3/2/6/132681495/1440479.pdf
    • https://cdn.shopify.com/s/files/1/0433/9059/9319/files/vokibax.pdf
    • https://cdn.shopify.com/s/files/1/0432/0513/2445/files/kededifojaduxugokifud.pdf
    • https://cdn.shopify.com/s/files/1/0437/3161/5909/files/bowigewowafaliparukeferi.pdf
    • https://cdn.shopify.com/s/files/1/0434/6196/8025/files/32307458787.pdf
    • https://cdn.shopify.com/s/files/1/0434/1114/4858/files/8815861979.pdf
    • https://cdn.shopify.com/s/files/1/0428/4933/7507/files/tri_merge_credit_report.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/botolewapaniwid.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/4077026649.pdf
    • https://cdn.shopify.com/s/files/1/0432/5965/8398/files/57378194849.pdf
    • https://cdn.shopify.com/s/files/1/0440/6778/2821/files/purizewokufegajufezomi.pdf
    • https://cdn.shopify.com/s/files/1/0429/2742/3654/files/mekuzejerivovudoz.pdf
    • https://cdn.shopify.com/s/files/1/0434/5341/5576/files/zerifidexo.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_off000049ba.bin
a5c368b4139055c5885246c0958a362def861a90c5587eee0e43e98f5e00ed15
pdf-font-stream PDF embedded font (sfnt) at offset 0x49BA 5584 bytes
font_01_sfnt_off00005cda.bin
a1350132138472efa210e68403708dd5e76cfbbdde53e54106ea60442071d2f0
pdf-font-stream PDF embedded font (sfnt) at offset 0x5CDA 9192 bytes