Malicious PDF — malware analysis report

Static analysis result for SHA-256 12adaa673b72f651…

MALICIOUS

PDF

78.6 KB Created: 2020-07-31 22:05:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 469b5e562c6bb5a2f5de4238d84a73c0 SHA-1: 409fdce014e11ae702e8a1b70d8df3835165d96f SHA-256: 12adaa673b72f6515c88d5613073274de4957d0cbad2a4a68040eb2d70ca64cc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a high number of embedded links, many pointing to external PDF files, indicating a link farm. One prominent link, 'https://ttraff.ru/pify?keyword=shadows+mantle+set+dungeon', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be heavily obfuscated or corrupted, but the presence of the malicious URL is the primary indicator of malicious intent.

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/pify?keyword=shadows+mantle+set+dungeon
    • http://files.jakanathomas.com/uploads/1/3/1/3/131381204/benewali.pdf
    • http://files.artbyguyyoung.com/uploads/1/3/0/7/130775195/9569679.pdf
    • http://files.shikareddy.com/uploads/1/3/2/7/132740275/9901524.pdf
    • http://files.the2degrees.org/uploads/1/3/1/3/131379059/cf1b4.pdf
    • http://files.searlneuropsychology.com/uploads/1/3/1/4/131437845/xisizulakin_kadixalufonaf_zuzesego_suluruzujuve.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/5045/8520/files/siworenusezivarip.pdf
    • https://cdn.shopify.com/s/files/1/0432/7214/3001/files/nejameguxumirawedepijugab.pdf
    • https://cdn.shopify.com/s/files/1/0427/6148/6503/files/47281705658.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4885/files/bigepesiboganonenuvifef.pdf
    • https://cdn.shopify.com/s/files/1/0428/3197/0460/files/35496513813.pdf
    • https://cdn.shopify.com/s/files/1/0434/1802/6141/files/duzuwusebasumugavifavo.pdf
    • https://cdn.shopify.com/s/files/1/0428/2833/3219/files/64515997076.pdf
    • https://cdn.shopify.com/s/files/1/0430/6377/1293/files/rupuganexuziju.pdf
    • https://cdn.shopify.com/s/files/1/0435/0361/6165/files/56146853990.pdf
    • https://cdn.shopify.com/s/files/1/0430/2651/4077/files/16854645075.pdf
    • https://cdn.shopify.com/s/files/1/0429/1444/7519/files/fokiradigo.pdf
    • https://cdn.shopify.com/s/files/1/0427/9618/7815/files/tejumavifavanomesuza.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea97.bin
1ab889ed00a6760b47dde5eb6456f4a4c90553bc7e66769b80625e7ecead1387		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA97 5172 bytes
font_01_sfnt_off0000fc17.bin
615d08667f6d6be0d54ebbc76204d35723a28c70750e4ab0d03585a21f8d979c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC17 10224 bytes
font_02_sfnt_off00011ef8.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF8 4324 bytes

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