Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5330393beac714d…

MALICIOUS

PDF

59.2 KB Created: 2020-08-23 23:03:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cccdd2315c4e6db197faa0848078488f SHA-1: ecdeca1a0d6b4d6381af2b1fb0b99a0098829f5d SHA-256: f5330393beac714d6b65b603115a31d4bde6eb3306836a2ee0c565c09fd9cfc5
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious due to a high number of embedded links, many pointing to external PDF files, suggesting a link farm or redirection tactic. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=double+meaning+question+with+answer'. The document body contains garbled text and a reference to the redirector URL, further supporting the malicious intent. 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.ru/pify?keyword=double+meaning+question+with+answer
    • http://rerisezu.guyinspired.com/uploads/1/3/0/7/130776031/0dff615723.pdf
    • http://files.gretashaven.com/uploads/1/3/2/7/132740670/sutuke-fimaxokape-baxuxupelowoj.pdf
    • http://jibivos.carpetcleaningstpete.com/uploads/1/3/0/7/130738948/zikuvunowimabafasor.pdf
    • http://files.kimberlywatson33.com/uploads/1/3/2/8/132814958/nutapudaro_jutuzibovi_rewifosusu.pdf
    • https://cdn.shopify.com/s/files/1/0428/7135/7596/files/11276630538.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/46676539889.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/69696378660.pdf
    • https://cdn.shopify.com/s/files/1/0431/9140/2660/files/tcfexpress_com_login.pdf
    • https://cdn.shopify.com/s/files/1/0430/8058/1274/files/xurokifules.pdf
    • https://cdn.shopify.com/s/files/1/0431/8851/9080/files/92098970222.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rerisorajomowuba.pdf
    • https://cdn.shopify.com/s/files/1/0431/1410/2950/files/44728110692.pdf
    • https://cdn.shopify.com/s/files/1/0430/3532/8663/files/66894315267.pdf
    • https://cdn.shopify.com/s/files/1/0431/7967/1718/files/nemiluxuxakuzuxuwe.pdf
    • https://cdn.shopify.com/s/files/1/0430/1458/6521/files/vopagibotatolimuf.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006604.bin
c44d13b419d5c592bfa43d3c04cb226f19078fac3224821583de3c74256fbfc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6604 5456 bytes
font_01_sfnt_off0000786a.bin
71d489ca799b404f92f1f265c0ad790831edaee34d417a17e5a0bcd97902c65b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x786A 2484 bytes
font_02_sfnt_off00008309.bin
c1e0506fe1d4850a8ed9db00bf68f22084c7b77eb8439d799db992f85cbab8bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8309 10160 bytes
font_03_sfnt_off0000a5ff.bin
aa92d2738bcdf8f42135d71e309a40fb09a5903672624ff5da4044cc57c33d50		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA5FF 17104 bytes
font_04_sfnt_off0000bdaf.bin
4a345fb655ee75fc122e7e73c7284ffe247be5d0ca40c2846725c0dfc6cbefb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBDAF 10332 bytes

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