Malicious PDF — malware analysis report

Static analysis result for SHA-256 55a8ca21a1c12e27…

MALICIOUS

PDF

40.2 KB Created: 2020-09-01 00:11:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9c6037f8f830b9196864e6da850365f SHA-1: d7f996bba4df67637bad19afbc54dec88c231917 SHA-256: 55a8ca21a1c12e27142bc5ebcb08f01e0407ac225aa1b0706354defd7aef8368
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, a common tactic for SEO poisoning or redirecting users to malicious sites. One of the embedded URLs, https://ttraff.cc/wix?keyword=impedance+matching+transformer+radio+shack, is identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness.

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=impedance+matching+transformer+radio+shack
    • https://static.usrfiles.com/ugd/b8c837_fe4d9c8af72f41e586bcfa1bbda90240.pdf
    • https://static.usrfiles.com/ugd/cc089a_528f3b2160674706b164add36d1e3240.pdf
    • https://static.usrfiles.com/ugd/87fdc7_4d6923e5dafc42eba2149fa9370a9ed2.pdf
    • https://static.usrfiles.com/ugd/b8c837_811a76de6e2a46d895548fab17035b52.pdf
    • https://static.usrfiles.com/ugd/6924eb_87631324e4274965a7e4987ffb5734c9.pdf
    • https://static.usrfiles.com/ugd/cd79e3_894fc9a50ab6488181ada31856a6fc12.pdf
    • https://cdn.shopify.com/s/files/1/0430/7550/2234/files/algebra_2_function_notation_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0430/4217/7181/files/21752154128.pdf
    • https://cdn.shopify.com/s/files/1/0431/6200/9755/files/71387884245.pdf
    • https://cdn.shopify.com/s/files/1/0433/5956/8037/files/late_roman_art_industry.pdf
    • https://cdn.shopify.com/s/files/1/0431/4998/3901/files/61414543284.pdf
    • https://cdn.shopify.com/s/files/1/0434/7405/9424/files/hypesquad_free_nitro.pdf
    • https://cdn.shopify.com/s/files/1/0433/7437/9157/files/59807149139.pdf
    • https://cdn.shopify.com/s/files/1/0446/6976/3747/files/profit_and_loss_appropriation_account_example.pdf
    • https://cdn.shopify.com/s/files/1/0434/7235/5478/files/jadelusikevitofem.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_off00005d4f.bin
5301490b4a14aab60c8027de9971c6446842b8c056f47436602a394a0fd93f5c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D4F 5536 bytes
font_01_sfnt_off00006ffd.bin
96faa437a8b85ba880ae0bba987de316ed5341575ad91b64091804db559ee180
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FFD 10736 bytes