Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a48fd0f054244f4…

MALICIOUS

PDF

49.9 KB Created: 2020-08-08 01:46:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2565ea3a667435bf298215d74142c61d SHA-1: 7cd9fb06142d0dfc0dad877275b92630c9ef3aec SHA-256: 7a48fd0f054244f449682a392219b7090a23589039f24ca5a8c70900ecce3bfd
194 Risk Score

Malware Insights

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

The PDF contains a lure related to 'Java aptitude questions' and embeds numerous links, including one to a known malicious redirector. The heuristic 'SE_ADVANCE_FEE_SCAM_LURE' indicates a scam, and the 'PDF_SEO_LINK_FARM' suggests the document is designed to generate traffic or SEO value through a large number of outbound links. The primary malicious link is https://ttraff.com/pify?keyword=java+aptitude+questions+and+answers+for+freshers+pdf, which is likely used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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/pify?keyword=java+aptitude+questions+and+answers+for+freshers+pdf
    • http://files.houseofpainters.com/uploads/1/3/0/7/130775786/gediforekemawa.pdf
    • http://tiralumod.tapestrymft.com/uploads/1/3/0/8/130874524/8545809.pdf
    • http://files.chrisclimateblog.org/uploads/1/3/2/6/132681647/0cecaa3a1c2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/0126/6851/files/16869460312.pdf
    • https://cdn.shopify.com/s/files/1/0440/6139/3046/files/71773408301.pdf
    • https://cdn.shopify.com/s/files/1/0431/7259/3832/files/pepajopiworemive.pdf
    • https://cdn.shopify.com/s/files/1/0437/7713/0658/files/wizenubejopipiriketuk.pdf
    • https://cdn.shopify.com/s/files/1/0434/8697/0021/files/berajab.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/moxudenolaruxorurafugi.pdf
    • https://cdn.shopify.com/s/files/1/0430/5872/5018/files/sotisobopud.pdf
    • https://cdn.shopify.com/s/files/1/0440/6303/1448/files/practical_phonetics_and_phonology_a_resource_book_for_students.pdf
    • https://cdn.shopify.com/s/files/1/0435/3091/1899/files/max_in_python.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/63537272249.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_off00008486.bin
9b8daf616527fe41ee2705e3a607c79d50685cf6884d6a7383e5265cb06ae9f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8486 5364 bytes
font_01_sfnt_off000096d5.bin
4d2113a806931a6d7ec8615d0238fefb36d6fe248dcace529f8550342b7ac848		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96D5 10540 bytes

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