Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc83c5d4faf6edd6…

MALICIOUS

PDF

35.2 KB Created: 2020-08-31 12:38:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 211f9a030e30e6ec3358f64f2d97b117 SHA-1: 858487207e2c686c3794d59a1f5d59b428a9dc8e SHA-256: fc83c5d4faf6edd6368b01d6fecdcc949f378f0ba03b88b6657557a378b58c4c
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the URL 'https://ttraff.club/wix?keyword=he+is+jealous+for+me+guitar+chords', which is also listed as an embedded URL. This link is likely intended to lead the user to a phishing or malware distribution site. The PDF also contains a large number of other embedded links, many pointing to static.usrfiles.com, which is flagged as a link farm.

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.club/wix?keyword=he+is+jealous+for+me+guitar+chords
    • https://static.usrfiles.com/ugd/a59130_e4cf5b0a78de4f5f8042f49978e16187.pdf
    • https://static.usrfiles.com/ugd/60933b_a98780b7a3624ba883e4697b13233995.pdf
    • https://static.usrfiles.com/ugd/b8c837_b92fa0b6174c46968c8cddc0ad240f12.pdf
    • https://static.usrfiles.com/ugd/41f880_e115f1a09f1c43f1bc2ae4246b456e07.pdf
    • https://static.usrfiles.com/ugd/b8c837_582e8594b21e426ab2e43ed936f35e88.pdf
    • https://static.usrfiles.com/ugd/d4579c_a9c245dc25844c2d83e46c0c3ad7e8aa.pdf
    • https://cdn.shopify.com/s/files/1/0432/0899/9074/files/73835430820.pdf
    • https://cdn.shopify.com/s/files/1/0431/6063/3493/files/novinigipiwowil.pdf
    • https://cdn.shopify.com/s/files/1/0427/4041/6678/files/28088286068.pdf
    • https://cdn.shopify.com/s/files/1/0433/5511/1589/files/73329676488.pdf
    • https://cdn.shopify.com/s/files/1/0431/6420/5216/files/mob_spawning_distance.pdf
    • https://static.usrfiles.com/ugd/47b1e8_78fd3de767e0413189aff036b0e1d1ba.pdf
    • https://static.usrfiles.com/ugd/b8c837_4fb26db367204bfb8582091008449cf7.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_off00004c13.bin
d694330b0c1e2622108adc524edbd32beafaf54afe1774111c3282f0c96f0507
pdf-font-stream PDF embedded font (sfnt) at offset 0x4C13 5472 bytes
font_01_sfnt_off00005e86.bin
bf3733c6c6c99d65badaed7ce0492b0a417275e8e4ceb439e124aac1f3155b60
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E86 9852 bytes