Malicious PDF — malware analysis report

Static analysis result for SHA-256 385fe768eb571ee7…

MALICIOUS

PDF

44.6 KB Created: 2020-09-01 12:14:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce22deaeaed4da75776c28955a7d56bb SHA-1: 4dbe2caf2c4397712e013e541e2920d6eabb6aaa SHA-256: 385fe768eb571ee7c6b4ce89836b56d8d9c629c34988ac25112fd535b8394361
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with one specifically pointing to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL that leads to the redirector, suggesting a social engineering lure. The ML classifier also strongly indicated 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.me/pify?keyword=twilight+bella%2527+s+lullaby+piano+sheet+music
    • https://static.usrfiles.com/ugd/a771bd_944a3b835d064eb8801c01cb9833037e.pdf
    • https://static.usrfiles.com/ugd/b8c837_5d850ccd029d4e1cb951f54a314fe7d0.pdf
    • https://static.usrfiles.com/ugd/6a7407_6b40767d6d4c485389c272725655476d.pdf
    • https://static.usrfiles.com/ugd/d01287_89bc37a5241a48f08b175430c1ea6701.pdf
    • https://static.usrfiles.com/ugd/b8c837_70e854ce6a3d4db89aedaaf136a267a3.pdf
    • https://static.usrfiles.com/ugd/b8c837_6e2bf76a4b564dcda30c20787716851e.pdf
    • https://static.usrfiles.com/ugd/f3ecbe_b96c16c49bf9407892e8ebed61b0a91a.pdf
    • https://static.usrfiles.com/ugd/e3834b_e30b9a5724094364b8ce4bb06c90d2a7.pdf
    • https://cdn.shopify.com/s/files/1/0438/9113/0536/files/abnormal_psychology_17th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0437/3417/1800/files/deadpool_wallpaper_hd_1080p_iphone.pdf
    • https://cdn.shopify.com/s/files/1/0433/3672/8726/files/dapebepixirite.pdf
    • https://cdn.shopify.com/s/files/1/0435/4624/7332/files/91124586636.pdf
    • https://cdn.shopify.com/s/files/1/0438/0504/8994/files/88248997462.pdf
    • https://static.usrfiles.com/ugd/e5412a_c9665d4c5bb6464196fd8feacc0adfa1.pdf
    • https://static.usrfiles.com/ugd/b8c837_c89d68849be6470da648a9c094566a68.pdf
    • https://static.usrfiles.com/ugd/c3f88d_dc7a943023194330bda054a74833822f.pdf
    • https://static.usrfiles.com/ugd/c8d394_d6cd5005e70549eb806e71a6988cfef3.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_off00005379.bin
c65616c6e81cdd8a06eaa1d389943599bd94cd9a7d9339532d76db6540e9bb5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5379 5448 bytes
font_01_sfnt_off000065f0.bin
62ae7feb5e2c44c9f6a74241f305bea31cdd47ecccea3427f383ca4e05def789		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65F0 15000 bytes
font_02_sfnt_off000094f1.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94F1 4324 bytes

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