Malicious PDF — malware analysis report

Static analysis result for SHA-256 743382a630cc02d0…

MALICIOUS

PDF

44.8 KB Created: 2020-08-12 03:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3358a0b43d49cca1fe595537e53f9e1e SHA-1: a71ec1f1d1a5ff5a8dc106a549ad02f8072ad75d SHA-256: 743382a630cc02d0940958070fe5772c84c302f8f5bd82f5af0b9bb409ff2043
154 Risk Score

Malware Insights

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

This PDF file contains a link farm and a direct link to a known malicious redirector infrastructure. The document body, though obfuscated, contains text that appears to be a lure for educational material, likely to trick users into clicking the malicious link. The ML classifier strongly indicated maliciousness, and the presence of numerous embedded URLs points to a phishing or scam attempt.

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.com/wb?keyword=rereading%20america%2010th%20pdf
    • http://files.putitbluntly.org/uploads/1/3/0/7/130740232/4218744.pdf
    • http://files.scifilms.co.nz/uploads/1/3/0/7/130740053/zawelab.pdf
    • http://files.dmfw223.com/uploads/1/3/2/6/132695445/lanezulomonejaxim.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/2521/1298/files/solved_quantitative_aptitude_questions.pdf
    • https://cdn.shopify.com/s/files/1/0429/0733/6867/files/java_string_compare.pdf
    • https://cdn.shopify.com/s/files/1/0431/5083/5878/files/impacto_del_neoliberalismo_en_mexico.pdf
    • https://cdn.shopify.com/s/files/1/0431/1243/1770/files/buvudasatewedunenidumasu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9096/8729/files/pokemon_ruby_gym_leader.pdf
    • https://cdn.shopify.com/s/files/1/0430/8697/1029/files/60106160180.pdf
    • https://cdn.shopify.com/s/files/1/0433/6903/7980/files/vovogevugij.pdf
    • https://cdn.shopify.com/s/files/1/0437/0671/2219/files/91194240731.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/55781022724.pdf
    • https://cdn.shopify.com/s/files/1/0432/9226/2560/files/to_verify_the_truth_table_of_logic_gates_experiment.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_off00006415.bin
3fcb45c2e2bcd6dfdbd67356a14ac1e9c4bd4e4a79b0e4b581b6e741b7ea988f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6415 5240 bytes
font_01_sfnt_off000075bc.bin
e4e74d7e904d993e0680a63c6e53c0a8d378a048a081efa847dee6f22ae594f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75BC 10216 bytes
font_02_sfnt_off0000986c.bin
ad623bc7c681097dfa1224999cf6cc6072d3ca9a137655dc1129b0261f0b357c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x986C 4324 bytes

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