Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a0cec064fffa3fa…

MALICIOUS

PDF

47.9 KB Created: 2020-08-30 04:20:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cae3f9ab203cba08a883618682f568e8 SHA-1: eb3211441a47f646a417cdede475a4f85d9f0c6a SHA-256: 3a0cec064fffa3faa948faf9bcf7489dc38a9dc5c709e860dbaf54bcc2d95749
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell

The PDF contains a link to a redirector URL, identified as malicious. The document body, though heavily obfuscated, contains text related to 'pps diaporamas magnifiques gratuit' and the malicious URL, suggesting a lure for free content. The PDF also hosts a large number of external links, many pointing to static.usrfiles.com, which is flagged as a link farm. The ML classifier strongly indicates 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.com/wix?keyword=pps+diaporamas+magnifiques+gratuit
    • https://static.usrfiles.com/ugd/d54300_4983431d410a4d7e8fc5368357a2c9c6.pdf
    • https://static.usrfiles.com/ugd/b8c837_0d92b88587ee450aaaa20a7ded358862.pdf
    • https://static.usrfiles.com/ugd/b8c837_0536c9bc57ad472bbb5a5fa32ff314f3.pdf
    • https://static.usrfiles.com/ugd/b8c837_03469f8f1a1c4133900d943862dac300.pdf
    • https://static.usrfiles.com/ugd/ce5d00_034b2947961b49c2ae67f3472db78e4d.pdf
    • https://static.usrfiles.com/ugd/2c8d66_c97363191fab498bb574edc0db3049ac.pdf
    • https://static.usrfiles.com/ugd/b8c837_6079867b06b74188bb3d28203a4506a9.pdf
    • https://cdn.shopify.com/s/files/1/0433/7342/8888/files/2528554621.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rapuz.pdf
    • https://cdn.shopify.com/s/files/1/0430/4027/6642/files/nibefos.pdf
    • https://cdn.shopify.com/s/files/1/0431/2812/7637/files/dont_starve_together_cheats.pdf
    • https://static.usrfiles.com/ugd/271e65_c8eca524a2be47a3a17b1701f456a470.pdf
    • https://static.usrfiles.com/ugd/b8c837_f52ec25b35d0407d8f27524e9b91a89d.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_off000079d2.bin
f526ded14ce44a081d9751f6adbfa39de8a8d8e907c11eed37cbe76679d0340d
pdf-font-stream PDF embedded font (sfnt) at offset 0x79D2 5456 bytes
font_01_sfnt_off00008c40.bin
0f0b801b2e45d31483bc9c1e4a7ec8caa032af8e62e60f6285fb645c854aaf49
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C40 12480 bytes