Malicious PDF — malware analysis report

Static analysis result for SHA-256 18339c9bee8deea9…

MALICIOUS

PDF

48.4 KB Created: 2020-08-19 11:30:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7fd9fecad963d2ee64e8f34d1bcad64a SHA-1: d1a42d5e319b7604a19ccf6bcd3bd4b5f95d6757 SHA-256: 18339c9bee8deea9d9ef725213dee13b87bd19371039b436da40d034bbcdac2c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure. It also exhibits a PDF link farm heuristic, suggesting an attempt to distribute or obscure malicious links. The embedded URL points to a redirector that likely leads to further malicious content or phishing pages.

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=bikroy+apk+premium
    • http://files.thejgparksblog.com/uploads/1/3/2/7/132740362/4607705.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/7496/8986/files/cinematography_lighting_tutorials.pdf
    • https://cdn.shopify.com/s/files/1/0437/9269/5458/files/77956715101.pdf
    • https://cdn.shopify.com/s/files/1/0435/4228/2394/files/mojesedikikuboxubovukuvu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3622/1341/files/rezugasolufalulezujixa.pdf
    • https://cdn.shopify.com/s/files/1/0432/2764/4072/files/bupesidikuzinafexinemi.pdf
    • https://cdn.shopify.com/s/files/1/0437/7516/4574/files/nezopibiwuziw.pdf
    • https://cdn.shopify.com/s/files/1/0453/2790/9019/files/fijejifutixafamubad.pdf
    • https://cdn.shopify.com/s/files/1/0434/3506/5505/files/dotabunoturatigumojapawop.pdf
    • https://cdn.shopify.com/s/files/1/0429/1038/4295/files/17996102162.pdf
    • https://cdn.shopify.com/s/files/1/0427/6404/2396/files/gijipuwip.pdf
    • https://cdn.shopify.com/s/files/1/0429/2725/9811/files/81332722675.pdf
    • https://cdn.shopify.com/s/files/1/0429/1297/2963/files/8598238798.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rosetotirumeza.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_off00006786.bin
d0413d5ac2b44320860be1626d5b5827e7d81e15083bf5b3a92a02fefee3a373
pdf-font-stream PDF embedded font (sfnt) at offset 0x6786 4664 bytes
font_01_sfnt_off00007767.bin
2011dd20df63ab23395e8c22392f39bff6c169e08c92c550b912f8e0dd99147f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7767 15284 bytes
font_02_sfnt_off0000a6ef.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0xA6EF 4324 bytes