Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d0a93c5e57b9e4f…

MALICIOUS

PDF

35.3 KB Created: 2020-08-30 02:01:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d029c6894c8dc29e1625e5a29a555126 SHA-1: ee2f167e05ba7f4b55aee18c12ab2963404a37a9 SHA-256: 2d0a93c5e57b9e4f1443431a6a6e19b23015a5db61fa66accf2c95ece9fe826c
152 Risk Score

Malware Insights

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

The PDF file was identified as malicious by an ML classifier and contains a critical heuristic firing for a malicious redirector link. The document body, though heavily obfuscated, contains the same malicious URL. The presence of a link farm with numerous external PDF links, many hosted on Shopify, suggests an attempt to obscure the ultimate destination and potentially evade detection.

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/wix?keyword=bidadari+tak+bersayap++mp4
    • https://static.usrfiles.com/ugd/b8c837_1649157441a143e9b41e4bcc65abc0a2.pdf
    • https://static.usrfiles.com/ugd/b4a829_7f7431d51d514a0f8536c2c1d0792737.pdf
    • https://static.usrfiles.com/ugd/2b25b5_df39e3b09c8248aa9f653f25d9a4071a.pdf
    • https://cdn.shopify.com/s/files/1/0439/1682/0635/files/43092875023.pdf
    • https://cdn.shopify.com/s/files/1/0431/2819/3184/files/31068063111.pdf
    • https://cdn.shopify.com/s/files/1/0438/4922/0256/files/lonard_de_vinci_la_joconde_ana.pdf
    • https://cdn.shopify.com/s/files/1/0427/4877/2508/files/levutubaw.pdf
    • https://cdn.shopify.com/s/files/1/0428/2191/0687/files/vmware_interview_questions_and_answers_2020.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/jejamoputujinufodom.pdf
    • https://cdn.shopify.com/s/files/1/0435/3343/5029/files/5344755340.pdf
    • https://cdn.shopify.com/s/files/1/0432/3534/4539/files/senuxazudiludufin.pdf
    • https://cdn.shopify.com/s/files/1/0429/7211/9193/files/dakalevinimixigekurizew.pdf
    • https://static.usrfiles.com/ugd/97aff7_52fb6ef32ddc4b17b6473f01b2b38ae7.pdf
    • https://static.usrfiles.com/ugd/b8c837_b8b935c27f3848fcb1c1a7360abe710a.pdf
    • https://static.usrfiles.com/ugd/67e251_de41663b0bb94b96ba81fcfcd5e29783.pdf
    • https://static.usrfiles.com/ugd/b8c837_8b19053dcb8b430fa29ae142c58b6a2b.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_off00004a2e.bin
e9b920ff43135078000ce5fd51b3bceca46f5c00dbc066ede6e069b7fb1709a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x4A2E 5516 bytes
font_01_sfnt_off00005ce5.bin
80994bcce2e1adae80503af0353b0f1cc0916d882ec4dbb778ae040d45882dc8
pdf-font-stream PDF embedded font (sfnt) at offset 0x5CE5 10480 bytes