Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ef7159fd329485b…

MALICIOUS

PDF

47.8 KB Created: 2020-08-20 06:41:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4f99ab4453a7405e1a1aa80eaf51053 SHA-1: a2521070d43e3dd8642d9b9ee82a1654e5269d14 SHA-256: 2ef7159fd329485b6ccdb157d37ddeeb62829f4a0a453ade8a451059f2834b00
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, characteristic of a link farm designed to manipulate search engine rankings or direct users to malicious sites. One of the primary links directs to a known malicious redirector, ttraff.ru, which is disguised as a search result for 'tamil god amman video songs'. The ML classifier also strongly flagged this PDF as malicious.

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=tamil+god+amman+video+songs
    • http://files.lifeisbeautifulandhealthy.com/uploads/1/3/1/4/131453267/sudutodunilez.pdf
    • https://cdn.shopify.com/s/files/1/0431/8078/5823/files/estimating_for_building_civil_engineering_work.pdf
    • https://cdn.shopify.com/s/files/1/0437/3803/8423/files/biforopasaduravoz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/46391305542.pdf
    • https://cdn.shopify.com/s/files/1/0430/0649/2823/files/android_camera_surfaceview_github.pdf
    • https://cdn.shopify.com/s/files/1/0431/1983/7333/files/kamaf.pdf
    • https://cdn.shopify.com/s/files/1/0428/2135/3635/files/subov.pdf
    • https://cdn.shopify.com/s/files/1/0439/8972/9438/files/paxasumuzimobasi.pdf
    • https://cdn.shopify.com/s/files/1/0435/4611/6248/files/jomitafi.pdf
    • https://cdn.shopify.com/s/files/1/0447/0875/7657/files/centesimus_annus_juan_pablo_ii.pdf
    • https://cdn.shopify.com/s/files/1/0439/5096/4904/files/que_son_las_bibliotecas_virtuales.pdf
    • https://cdn.shopify.com/s/files/1/0431/2186/8960/files/52238697369.pdf
    • https://cdn.shopify.com/s/files/1/0434/0934/2621/files/java_import_scanner.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_off00004fd0.bin
1361c5c2c82a66bb0c5068da194a150dbd0da2c96ff4dca243c65f8587f04ac7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4FD0 5056 bytes
font_01_sfnt_off000060f8.bin
73d8f78ce2ba61404cbcee35a44f51638158f242d897aba16a358dd1832be552		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60F8 6456 bytes
font_02_sfnt_off000074c6.bin
6ae8b93a02dfafd46485bd0cb91c6d6ac8c98630da59ff50e4bba36e173c40b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74C6 2700 bytes
font_03_sfnt_off00008054.bin
9c4ebb754e15bcbb906e37c0324f4ce732667dfab0db40b7a76d5f035bf6acd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8054 15336 bytes

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