Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a069efb17b54856…

MALICIOUS

PDF

54.3 KB Created: 2020-08-16 12:20:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7a03c23000128ba136987ffd45b51b5 SHA-1: 662318137684459e34fc47bc0849c470ef3eef98 SHA-256: 6a069efb17b5485699327b64a50863f73204e0e0bf87f9cc3151c4a9d6229bd4
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with the primary URL identified as a malicious redirector. The ML classifier strongly indicates maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lure users to malicious content, potentially for phishing or malware distribution.

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.ru/pify?keyword=bhairava+padam++tamil
    • http://valujo.21cclcdm.com/uploads/1/3/1/8/131871390/e67ec.pdf
    • http://newumubi.chattanoogaclarinetchoir.com/uploads/1/3/1/3/131379485/fijotopasisetav.pdf
    • http://files.brownlegacyproducts.com/uploads/1/3/1/3/131380616/5378175.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/7056/3239/files/biology_essay_questions_and_answers_form_4.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/35679391278.pdf
    • https://cdn.shopify.com/s/files/1/0435/6263/1326/files/15283674618.pdf
    • https://cdn.shopify.com/s/files/1/0431/4441/3350/files/gokawomin.pdf
    • https://cdn.shopify.com/s/files/1/0433/8801/0659/files/53773139186.pdf
    • https://cdn.shopify.com/s/files/1/0431/0256/8599/files/6749581519.pdf
    • https://cdn.shopify.com/s/files/1/0430/3739/3049/files/100950327.pdf
    • https://cdn.shopify.com/s/files/1/0440/4133/9030/files/clicker_heroes_solomon.pdf
    • https://cdn.shopify.com/s/files/1/0433/0258/4480/files/30284892621.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/3100392900.pdf
    • https://cdn.shopify.com/s/files/1/0432/1896/0545/files/misres_du_dsir_alain_soral.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008301.bin
e4a19b0f24a3450a9035535c4ed8b2e1fb8a5d894d6af34dbdb2899374a5e5dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8301 5132 bytes
font_01_sfnt_off00009457.bin
db3c0f93e62ce8929b0bfbeec6ffa1875e8b7a324ece1bfe48beab0695cceb6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9457 10104 bytes
font_02_sfnt_off0000b72d.bin
ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB72D 16164 bytes

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