Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffc76a6ea4101abe…

MALICIOUS

PDF

42.6 KB Created: 2020-08-29 21:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10a50941990c8216c0d6101a99572386 SHA-1: 9f646d83af6be75345eee085e295162509adce2d SHA-256: ffc76a6ea4101abec4cd7985439abb628a0ca4d1172763b0b512e547e5e41539
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with one critical heuristic identifying it as a PDF link farm. The primary URL, 'https://ttraff.ru/wix?keyword=how+to+make+dog+smell+good', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, appears to contain the same URL and other PDF 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.ru/wix?keyword=how+to+make+dog+smell+good
    • https://static.usrfiles.com/ugd/b8c837_16f109af16784a0ba3310f4d05027548.pdf
    • https://static.usrfiles.com/ugd/b8c837_1c45879901e34e7a9171cf37e6f36f16.pdf
    • https://static.usrfiles.com/ugd/b8c837_9e1e337cd6fd4260911a757f1980cbd0.pdf
    • https://static.usrfiles.com/ugd/b8c837_4b28dbd51aa849438d16c2af0ff31a96.pdf
    • https://static.usrfiles.com/ugd/b8c837_093474b3ac45464aa9073fb644ee5b99.pdf
    • https://cdn.shopify.com/s/files/1/0437/8768/1952/files/27049372432.pdf
    • https://cdn.shopify.com/s/files/1/0429/6838/3641/files/toruzoxugipulerub.pdf
    • https://cdn.shopify.com/s/files/1/0430/6731/0231/files/vumadeperepo.pdf
    • https://cdn.shopify.com/s/files/1/0429/7441/2949/files/murej.pdf
    • https://cdn.shopify.com/s/files/1/0435/4693/5451/files/aprenda_a_desenhar_super_herois.pdf
    • https://cdn.shopify.com/s/files/1/0461/5421/9683/files/autodesk_revit_2020.pdf
    • https://cdn.shopify.com/s/files/1/0449/7742/2494/files/chained_to_the_rhythm_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0431/3966/1981/files/gudejemomujafovavemiwexi.pdf
    • https://cdn.shopify.com/s/files/1/0428/4959/9651/files/sejezigilijisomovonama.pdf
    • https://cdn.shopify.com/s/files/1/0430/1550/4029/files/99078269791.pdf
    • https://cdn.shopify.com/s/files/1/0440/7151/8373/files/sakiganudolivonot.pdf
    • https://cdn.shopify.com/s/files/1/0429/8804/4442/files/sepsis_diagnosis_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0432/0316/6372/files/52604236497.pdf
    • https://cdn.shopify.com/s/files/1/0430/7861/5189/files/63571020857.pdf
    • https://cdn.shopify.com/s/files/1/0428/6126/5062/files/18223768218.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_off00006a22.bin
8b232932b5e2d346158119f2b3c6ec6ce1821ab9496e1d4d465987d4e2380f7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A22 5168 bytes
font_01_sfnt_off00007bb4.bin
f374cb1d5433506d994d83d816981ba57d7e41572eee99b7cacb61cea292284c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BB4 9956 bytes

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