Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a56328050bf8245…

MALICIOUS

PDF

45.7 KB Created: 2020-08-07 23:25:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f76864849fd59dcffec4fd4aeafb0bce SHA-1: f15ea548dd6f089c060a88a1d74cbc128a29e11f SHA-256: 1a56328050bf82450c803cc8b03a3ac469bea074f246b7a095da424f6717b684
152 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which are to external sites, and one specific link is identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'electronics and communication engineering books pdf free' and the malicious redirector URL. This suggests a social engineering lure to trick users into clicking the link, which then leads to malicious infrastructure.

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=electronics+and+communication+engineering+books+pdf+free
    • http://files.liberalcoalition.com/uploads/1/3/1/3/131384113/dogirolamomegedavegi.pdf
    • http://files.technicalwritingonline.net/uploads/1/3/0/7/130739060/vokezanekapuzevut.pdf
    • http://files.culinaryvacationsinc.com/uploads/1/3/1/4/131437924/donuxowodunejuvito.pdf
    • http://files.rebeccaevans4gower.com/uploads/1/3/1/6/131636728/9387543.pdf
    • https://cdn.shopify.com/s/files/1/0447/2619/0234/files/cello_scales_and_arpeggios.pdf
    • https://cdn.shopify.com/s/files/1/0433/9240/1566/files/base64_to_javascript.pdf
    • https://cdn.shopify.com/s/files/1/0434/5203/9328/files/46070422853.pdf
    • https://cdn.shopify.com/s/files/1/0434/0603/3052/files/ielts_speaking_part_3_sample_questions.pdf
    • https://cdn.shopify.com/s/files/1/0431/5352/2850/files/30198712957.pdf
    • https://cdn.shopify.com/s/files/1/0432/4586/3067/files/dexekizolos.pdf
    • https://cdn.shopify.com/s/files/1/0430/5354/7677/files/guresosupifobe.pdf
    • https://cdn.shopify.com/s/files/1/0431/0636/9703/files/expressive_and_receptive_language_disorder.pdf
    • https://cdn.shopify.com/s/files/1/0436/9717/6741/files/employees_provident_fund_act_1952_bare_act.pdf
    • https://cdn.shopify.com/s/files/1/0428/8613/5961/files/comunismo_e_socialismo_em.pdf
    • https://cdn.shopify.com/s/files/1/0434/8251/3570/files/43181324335.pdf
    • https://cdn.shopify.com/s/files/1/0432/4537/1549/files/simokijawowulezab.pdf
    • https://cdn.shopify.com/s/files/1/0428/2269/7126/files/jafelusopujudixokebaloxiv.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fb0.bin
9432cbd7920fda0780bd0e7690e7d7701c86b95a3f0fd30e0010804858c9d46a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FB0 5636 bytes
font_01_sfnt_off000072bf.bin
89454d8ece1be00d2333aac76955f46ed17c4d141322e635bf27f42efb43e54e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72BF 2116 bytes
font_02_sfnt_off00007c8b.bin
fe83f4fef679dc55740a60c5dbc548d4ee2f49ea75f2a95646be237faa678247		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C8B 14336 bytes

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