Malicious PDF — malware analysis report

Static analysis result for SHA-256 a853aa23dca9e866…

MALICIOUS

PDF

34.0 KB Created: 2020-08-29 16:36:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7dfb4b9cb4f7f26edb6e02955f31a66 SHA-1: 29f049ac7eaa468fe3ee73af4dc9bfad9abf6d4c SHA-256: a853aa23dca9e8669c577d3908bc5fc6bcffa3b971398655da1b3631b4339659
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, many of which point to external resources. One critical heuristic firing indicates that the document links to known malicious redirector infrastructure, specifically 'https://ttraff.ru/wix?keyword=gravity+falls+lost+legends+online'. The document body, though heavily obfuscated, contains text related to 'Gravity Falls Lost Legends' and the malicious URL, suggesting a lure to drive traffic to malicious sites. No scripts were extracted from this sample.

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.ru/wix?keyword=gravity+falls+lost+legends+online
    • https://cdn.shopify.com/s/files/1/0431/5407/9910/files/arduino_android_app_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0430/8510/3255/files/botidal.pdf
    • https://cdn.shopify.com/s/files/1/0434/3637/6214/files/widudenipofagasadojovuz.pdf
    • https://cdn.shopify.com/s/files/1/0437/0222/3013/files/.pdf
    • https://cdn.shopify.com/s/files/1/0434/8700/2790/files/bacterias_coliformes_em_agua_de_consumo.pdf
    • https://cdn.shopify.com/s/files/1/0432/8328/4136/files/46775200276.pdf
    • https://static.usrfiles.com/ugd/b8c837_79014978337143ef8aa256f3ebac420b.pdf
    • https://static.usrfiles.com/ugd/b8c837_c75bab433d8c4b67ad5ce6b245600aad.pdf
    • https://static.usrfiles.com/ugd/b8c837_9586012e658f4a18b04395e18214053e.pdf
    • https://static.usrfiles.com/ugd/b8c837_b26f7a0d469e45d6a550604b79796a6e.pdf
    • https://static.usrfiles.com/ugd/b8c837_15da5ebc1360471ab55a8ca19d7e0308.pdf
    • https://static.usrfiles.com/ugd/b8c837_8561ea4ef212406ea4f6aa3007d15b07.pdf
    • https://static.usrfiles.com/ugd/b8c837_545d58b1651b46a18cf7f2d7318c0028.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_off00004761.bin
24f282d702729741b1a2446c75fa89f972ba3e42f09a8fc57004b7ac0d888396
pdf-font-stream PDF embedded font (sfnt) at offset 0x4761 5268 bytes
font_01_sfnt_off0000596e.bin
c4dfd4c9ae0eb6b422834d90b970cc135c33dbd66270afb9dc93a4b75646dcbc
pdf-font-stream PDF embedded font (sfnt) at offset 0x596E 10004 bytes