Malicious PDF — malware analysis report

Static analysis result for SHA-256 54149c0a9b023d33…

MALICIOUS

PDF

40.8 KB Created: 2020-09-05 14:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15e7b5cdbca090e10fd37ea3a9d3fa19 SHA-1: 5aa69a1426cfa8928691db79129d288bf59488de SHA-256: 54149c0a9b023d3368b452424092766139682fad0662d234e36cb0f53af807a4
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to Shopify and static.usrfiles.com domains, forming a link farm. One prominent link, 'https://ttraff.link/wix?keyword=kawakami+gift+guide', is identified as a malicious redirector. The document body, though partially corrupted, contains text related to a 'Kawakami gift guide', suggesting a lure to entice users to click on the malicious links.

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.link/wix?keyword=kawakami+gift+guide
    • https://cdn.shopify.com/s/files/1/0429/6772/8279/files/8084247725.pdf
    • https://cdn.shopify.com/s/files/1/0429/5645/6095/files/33904863528.pdf
    • https://cdn.shopify.com/s/files/1/0432/9829/1870/files/bixobuwulobazefiboma.pdf
    • https://static.usrfiles.com/ugd/1b8612_2233594d5e6840d5b262f1c9611524ef.pdf
    • https://static.usrfiles.com/ugd/39cb9d_e1c4562f761342e99a489a11bda87b40.pdf
    • https://static.usrfiles.com/ugd/b910ae_3dd2599279824433af4e70131a44b32d.pdf
    • https://static.usrfiles.com/ugd/271e65_0f2571c8e1e544ac9a63c904c87484ae.pdf
    • https://static.usrfiles.com/ugd/f8de3e_da46a5e4eea84d22a1878cf8864df008.pdf
    • https://static.usrfiles.com/ugd/dc51bb_a6c4024b8042402599b268f7cecb88a2.pdf
    • https://static.usrfiles.com/ugd/b8c837_b541fc231e8e4f18aa0aca1f83c085ed.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_off0000629c.bin
edc45b5996ba223aab44f01c5659684435057918d17b979777cb8e15b413d60e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x629C 5044 bytes
font_01_sfnt_off000073d5.bin
b4bc70bc96e99ca1b3bc72f32471f8e15862318c02a04f03efa1be3ca1b4ed90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73D5 10628 bytes

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