Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cc4fdf9217b0306…

MALICIOUS

PDF

45.0 KB Created: 2020-08-29 17:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9b0c1b904a5d7f73f90ca849cc60179 SHA-1: b97510c73965521f7057df9c2c2d17c9658f1b7e SHA-256: 1cc4fdf9217b0306dd17ca154d40b783f6d7895b7622cb8a24614549ac6c9511
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Addends T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to shopify.com domains with seemingly random filenames, but ultimately lead to the ttraff.com redirector. This suggests a link farm or SEO poisoning tactic to lure unsuspecting users. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was heavily obfuscated.

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.com/wix?keyword=belajar+hangul+pdf
    • https://cdn.shopify.com/s/files/1/0465/2800/4254/files/update_driver_usb_windows_7.pdf
    • https://cdn.shopify.com/s/files/1/0433/1434/8197/files/99147137967.pdf
    • https://cdn.shopify.com/s/files/1/0431/8570/1019/files/jimmy_choo_choo_punjabi_song_mp4.pdf
    • https://cdn.shopify.com/s/files/1/0432/4684/6107/files/67375906012.pdf
    • https://cdn.shopify.com/s/files/1/0433/6261/5446/files/lumisibifapofizixiw.pdf
    • https://cdn.shopify.com/s/files/1/0434/2808/5911/files/calendario_rusia_2020_hora_colombiana.pdf
    • https://static.usrfiles.com/ugd/b8c837_207b4d899bf84769bf205cc39dfc9b4f.pdf
    • https://static.usrfiles.com/ugd/b8c837_f8f5da4104c14252bd22190d61d8cc19.pdf
    • https://static.usrfiles.com/ugd/b8c837_1de87f838e7b449388f40ad979f462a4.pdf
    • https://static.usrfiles.com/ugd/b8c837_ab1ce2e910374072bfb857a175e262b6.pdf
    • https://static.usrfiles.com/ugd/b8c837_d08cb33ae5f14941bfc7375b4b153197.pdf
    • https://cdn.shopify.com/s/files/1/0432/4347/1008/files/lp_dan_askep_hepatoma.pdf
    • https://cdn.shopify.com/s/files/1/0434/7356/7901/files/2005997009.pdf
    • https://cdn.shopify.com/s/files/1/0447/9166/0695/files/87124002061.pdf
    • https://cdn.shopify.com/s/files/1/0429/5085/2762/files/lavazawiwatapavi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005768.bin
fae42df6dc422e5b7bb1f8e3239636290a0a9afdb9faf0c784f076a0fe074d2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5768 4944 bytes
font_01_sfnt_off0000685d.bin
e814e9a6bad5fdda784919fca92be741e90a2069248d8ad099d97d38c78eb349		 pdf-font-stream PDF embedded font (sfnt) at offset 0x685D 5248 bytes
font_02_sfnt_off000079f7.bin
53dca172c621a308a8305a5bdb0f88f712759be89a4aeccf8a537277c55493c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79F7 2644 bytes
font_03_sfnt_off0000843d.bin
d6512bc01ea7061e08f1c72aed3600bbb3bb0313b80741e638f9aeadb8e1571a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x843D 10060 bytes

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