Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9dadd8c85f96240…

MALICIOUS

PDF

52.1 KB Created: 2020-08-31 00:24:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd011db0a801f077f0725fadced3d638 SHA-1: eabea97bf01f4f04fe6c365a3676de10af3f21fe SHA-256: f9dadd8c85f962409deab588199facdd010816097cac2b46c03801a55c862d6e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a prominent link that redirects to 'ttraff.ru', identified as a malicious redirector. This suggests a phishing or social engineering attack aiming to lead the user to malicious content. The PDF also contains a large number of external links, many of which are benign Shopify URLs, but the primary malicious link is the most critical IOC. The ML classifier strongly supports the malicious verdict.

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/wix?keyword=red+hat+linux+pdf+download
    • https://cdn.shopify.com/s/files/1/0437/7139/6257/files/xutopizesorupipafa.pdf
    • https://cdn.shopify.com/s/files/1/0439/3818/5384/files/bluestone_alley_easy_piano_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0432/0028/2785/files/lexus_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/kegalukafuletonu.pdf
    • https://cdn.shopify.com/s/files/1/0437/4921/2309/files/nezejod.pdf
    • https://static.usrfiles.com/ugd/b8c837_eedcbe1b79fb4250bed3d31a71959b16.pdf
    • https://static.usrfiles.com/ugd/469aea_bbf5240adf11424bb963a755767dd812.pdf
    • https://static.usrfiles.com/ugd/822ecd_48770737adac450d85b582fe62b754e3.pdf
    • https://static.usrfiles.com/ugd/b8c837_004b04228d004325abd11dc9426fcc80.pdf
    • https://static.usrfiles.com/ugd/432b07_df3e0f74a7254df7b4da967d20847bc3.pdf
    • https://static.usrfiles.com/ugd/45e30f_79047a6b68744ed286dc80184e6e983d.pdf
    • https://static.usrfiles.com/ugd/b8c837_d49cddcac9fe473ba4c0d60ba5c2a61f.pdf
    • https://static.usrfiles.com/ugd/0aab01_adf0de15dada4271a7e91641ce65b8fa.pdf
    • https://static.usrfiles.com/ugd/5b9a87_7cae1e872e7a4cb59d7d9286f7393847.pdf
    • https://static.usrfiles.com/ugd/b8c837_4f3c77502bd8481685a7886b86258d2a.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_off00008ce8.bin
c5bfe8cb342c3a331c891d9d6e29a1216ddd93dfe68b1c10892b600ffb9885f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x8CE8 5024 bytes
font_01_sfnt_off00009e1a.bin
876516e66d6809ef7c6afc1a61468478aa1ce23e2199d408ba52c4b72d3f2a6e
pdf-font-stream PDF embedded font (sfnt) at offset 0x9E1A 11012 bytes