Malicious PDF — malware analysis report

Static analysis result for SHA-256 3829112e33666fc1…

MALICIOUS

PDF

45.8 KB Created: 2020-08-02 10:26:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dbabb24eaac2b9619d610d25c9a87137 SHA-1: bbc3e90c9e74f4e0fe25aed0689d04603a1f9a72 SHA-256: 3829112e33666fc1971af7e29c4d840f8aa845031cbbb6a3c0e57df9630f666e
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 Shopify domains hosting other PDFs, forming a link farm. One of these links, https://ttraff.cc/pify?keyword=shifty+eyes+meme, is identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body itself is largely obfuscated but contains the same redirector URL and references to a "shifty eyes meme", suggesting a lure.

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.cc/pify?keyword=shifty+eyes+meme
    • http://files.bearcatmusic.org/uploads/1/3/0/7/130738720/3054898.pdf
    • http://files.flinthillsneuropsych.com/uploads/1/3/2/6/132683142/5247928.pdf
    • http://files.nicoleplettsfineart.com/uploads/1/3/1/4/131437815/derisuzebiba.pdf
    • http://files.wellfitmn.com/uploads/1/3/2/6/132695493/wewuse_minuzako_bukolexinexipid_jaronuf.pdf
    • https://cdn.shopify.com/s/files/1/0434/7622/2118/files/super_sweet_16_the_movie.pdf
    • https://cdn.shopify.com/s/files/1/0428/8000/8355/files/fotiruvewuwaxok.pdf
    • https://cdn.shopify.com/s/files/1/0430/9463/8749/files/81765941455.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53681635306.pdf
    • https://cdn.shopify.com/s/files/1/0440/5238/1846/files/nijelamosabasorotuzegiziz.pdf
    • https://cdn.shopify.com/s/files/1/0431/6990/6854/files/bisek.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/87195604050.pdf
    • https://cdn.shopify.com/s/files/1/0440/6788/1125/files/93096130793.pdf
    • https://cdn.shopify.com/s/files/1/0431/3789/2509/files/57982885697.pdf
    • https://cdn.shopify.com/s/files/1/0427/5326/1724/files/zipeduxetezijomu.pdf
    • https://cdn.shopify.com/s/files/1/0437/6104/1569/files/wowepex.pdf
    • https://cdn.shopify.com/s/files/1/0429/0750/0711/files/96035921703.pdf
    • https://cdn.shopify.com/s/files/1/0432/6873/5140/files/95042716511.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b5d.bin
4774f3ea202d4f1292bc69dbc1456c6121b2b328b7b0a8ca557320e160ee9e0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B5D 4872 bytes
font_01_sfnt_off00007bd6.bin
b04d542456249283cbc295c736d66a1700b58c2bd1aa6482cb816862dc56e530		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BD6 2060 bytes
font_02_sfnt_off0000856f.bin
db2b07b53651212981d7bfdfdf8ec716bcc5161bebd4f23e54d57c6134b608b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x856F 10616 bytes

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