Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cfdc1a4f9ca68d1…

MALICIOUS

PDF

47.2 KB Created: 2020-08-11 00:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1843f0681899460cd46fd8af84a32f83 SHA-1: 756b3d8db969e6e5c42d4e3f23d032dee7a10279 SHA-256: 1cfdc1a4f9ca68d1d51815370fd124e0987eb4e7f6e284880cd1625522485c83
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to what appears to be an SEO link farm designed to distribute PDF files. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is likely the primary malicious payload delivery mechanism. The document body, though heavily obfuscated, contains the target URL, suggesting a social engineering lure to trick users into clicking the malicious link.

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=annihilation+of+caste+book+in+tamil+pdf
    • http://files.donshireministries.org/uploads/1/3/1/4/131438874/b13d4e5.pdf
    • http://files.busyseasonstaffing.com/uploads/1/3/0/7/130739153/vukivatigemere.pdf
    • http://kamid.mcatoncreations.com/uploads/1/3/0/8/130814328/banosekatovo.pdf
    • http://files.redesignforwholefamilies.com/uploads/1/3/1/8/131857193/jowudakavesof-rusodisoton-zofokizubolas.pdf
    • http://files.hollisguitars.com/uploads/1/3/1/6/131636814/gitawi.pdf
    • https://cdn.shopify.com/s/files/1/0436/1102/9667/files/beowulf_short_summary.pdf
    • https://cdn.shopify.com/s/files/1/0437/1742/7352/files/slippin_dmx_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0435/3946/4341/files/vejuz.pdf
    • https://cdn.shopify.com/s/files/1/0431/8298/1278/files/vrv_watchlist_gone.pdf
    • https://cdn.shopify.com/s/files/1/0430/0419/9075/files/51558219191.pdf
    • https://cdn.shopify.com/s/files/1/0436/4324/0606/files/ninatomizefaxojizugav.pdf
    • https://cdn.shopify.com/s/files/1/0436/4002/9344/files/kevidixomojufifaxupasib.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/23582012054.pdf
    • https://cdn.shopify.com/s/files/1/0436/0637/6611/files/server_refused_our_key.pdf
    • https://cdn.shopify.com/s/files/1/0430/6213/2897/files/84131033365.pdf
    • https://cdn.shopify.com/s/files/1/0437/8414/2997/files/public_finance_book_download.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_off0000642f.bin
2600fcab0fa6b405cda06482104482344d3809548199e7f2f0676a0954c73037		 pdf-font-stream PDF embedded font (sfnt) at offset 0x642F 5280 bytes
font_01_sfnt_off000075e3.bin
daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75E3 1800 bytes
font_02_sfnt_off00007e71.bin
7164b80f97f1e4d42d50b1be99339764b655d7038f145edf2a6b066b9448264e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E71 10116 bytes
font_03_sfnt_off0000a111.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA111 4324 bytes

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