Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba747db3298d77b2…

MALICIOUS

PDF

40.2 KB Created: 2020-08-26 00:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c81b42ee45a0db2dd981b2635d17c72 SHA-1: d2dda96ee686901d53b62c6acbc2d98fe2b0f884 SHA-256: ba747db3298d77b256e0018fdb668e2fe7dc7a9a718ad4a2b97175f8e882ce95
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be malformed or heavily obfuscated, but the presence of the malicious redirector URL and the link farm strongly suggest an attempt to lure users to malicious content or manipulate search engine results.

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=pixel+3+manual+focus
    • http://files.kimmyangelique.com/uploads/1/3/1/0/131070246/volibesitipoteza.pdf
    • http://files.woggley.com/uploads/1/3/2/6/132695994/55c8508fb8.pdf
    • https://cdn.shopify.com/s/files/1/0431/3199/4280/files/kipizuwosetizefegewopu.pdf
    • https://cdn.shopify.com/s/files/1/0430/0318/3258/files/vidmate_apple_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/3781/0075/files/tugobedotogizoze.pdf
    • https://cdn.shopify.com/s/files/1/0436/9340/8409/files/1413645187.pdf
    • https://cdn.shopify.com/s/files/1/0434/4479/7600/files/sagebapusite.pdf
    • https://cdn.shopify.com/s/files/1/0434/8831/3506/files/human_anatomy_and_physiology_lab_manual_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/4375/7992/files/43267917847.pdf
    • https://cdn.shopify.com/s/files/1/0438/5056/3734/files/92453829327.pdf
    • https://cdn.shopify.com/s/files/1/0429/5491/5993/files/chemical_equilibrium_chemistry.pdf
    • https://cdn.shopify.com/s/files/1/0429/3191/2857/files/dalavub.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_off00006068.bin
3e050d7d7362fbb976a4f01cb498f69fe18d9e4cf52638fd5222b7a1f6ae7028
pdf-font-stream PDF embedded font (sfnt) at offset 0x6068 5164 bytes
font_01_sfnt_off000071ee.bin
8623423f29c625e42d3ffa7deaafcc60ba7193aa67fa81cf60b69d97444b916f
pdf-font-stream PDF embedded font (sfnt) at offset 0x71EE 10088 bytes