Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5b1208533b0675c…

MALICIOUS

PDF

33.7 KB Created: 2020-08-21 22:21:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dfcf773105d83a6ea002b79620449284 SHA-1: 7308cb174e38124162cd2a41b6edad42ec565fb1 SHA-256: f5b1208533b0675cca9fef5027b86bfb8bc117eec51501ea9a0c116f4b7b7114
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to a redirector service (ttraff.cc) known for malicious activity. The document body, though heavily obfuscated, contains a URL that appears to be part of this link farm. The ML classifier strongly indicated maliciousness, and the presence of a redirector link supports a phishing or malware distribution attack pattern.

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=2016+chevy+traverse+lt+manual
    • http://bedelaxo.kkylambdapsi.com/uploads/1/3/0/7/130775680/6809261.pdf
    • http://danavig.robert-poole-law.com/uploads/1/3/1/3/131380755/87f14d4.pdf
    • http://jufokem.sakanienglishcoach.com/uploads/1/3/1/4/131437089/3c052f4f47c9.pdf
    • https://cdn.shopify.com/s/files/1/0429/9145/2314/files/67165270064.pdf
    • https://cdn.shopify.com/s/files/1/0429/9105/9097/files/20223026833.pdf
    • https://cdn.shopify.com/s/files/1/0428/9213/2508/files/2199411604.pdf
    • https://cdn.shopify.com/s/files/1/0430/1540/5725/files/phonics_worksheets_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/3916/1500/files/procalcitonina_neonatos.pdf
    • https://cdn.shopify.com/s/files/1/0434/0508/2776/files/bksb_english_initial_assessment_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/0525/5577/files/mejigirexalisudexite.pdf
    • https://cdn.shopify.com/s/files/1/0428/0041/4883/files/68374371226.pdf
    • https://cdn.shopify.com/s/files/1/0431/6377/9236/files/12156429778.pdf
    • https://cdn.shopify.com/s/files/1/0434/8366/0441/files/824823451.pdf
    • https://cdn.shopify.com/s/files/1/0432/0716/4064/files/59512262678.pdf
    • https://cdn.shopify.com/s/files/1/0431/8098/2438/files/words_list_for_spelling_bee_competition.pdf
    • https://cdn.shopify.com/s/files/1/0429/5750/4668/files/book_of_assistance_arabic.pdf
    • https://cdn.shopify.com/s/files/1/0445/6457/8463/files/laundry_symbols_guide.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_off00004732.bin
5e98acfc05e783da472471c1c39306866d04dfef168de694bc62743cb6761556
pdf-font-stream PDF embedded font (sfnt) at offset 0x4732 5588 bytes
font_01_sfnt_off00005a0e.bin
52ff92dcd3b3bd6b336ab0acbf21a2f875a78c8423307734e4ec49e7bdb7a1d9
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A0E 9264 bytes