Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d13320c3703a79c…

MALICIOUS

PDF

36.3 KB Created: 2020-08-11 15:08:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 169a72d582b8c3242561f65e11377970 SHA-1: 66abdcdf688eb14d264f83b97d9af7fa62358809 SHA-256: 3d13320c3703a79c1e9f96ab89bf19f257f0399bff9672c962bf2b9e3e519b38
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, a technique often used for SEO poisoning or to host malicious content. One critical heuristic identified a link to a known malicious redirector, ttraff.com, with a keyword suggesting a lure for a calculator manual. The document body also contains this URL and numerous other links, including to Shopify domains, some of which are confirmed benign while others are unknown. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves luring the user to click the malicious link, likely leading to a compromised site.

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.com/wb?keyword=calculadora%20casio%20fx-82ms%20manual
    • http://files.room4love.org/uploads/1/3/0/8/130874458/koban_subozad_lalak_wifufup.pdf
    • http://baxakepo.westside-church.com/uploads/1/3/0/9/130969060/7687076.pdf
    • http://files.louisescott-bushell.com/uploads/1/3/1/3/131397927/41f2d13db7bb.pdf
    • https://cdn.shopify.com/s/files/1/0438/6953/6411/files/higher_engineering_mathematics_by_bv_ramana_download.pdf
    • https://cdn.shopify.com/s/files/1/0440/1332/2398/files/wiczenia_angielski_dla_dzieci.pdf
    • https://cdn.shopify.com/s/files/1/0434/0085/5706/files/19387498123.pdf
    • https://cdn.shopify.com/s/files/1/0428/9085/4566/files/56295919953.pdf
    • https://cdn.shopify.com/s/files/1/0432/0677/0849/files/zinakanini.pdf
    • https://cdn.shopify.com/s/files/1/0434/7016/0032/files/treatment_of_abnormal_behavior.pdf
    • https://cdn.shopify.com/s/files/1/0427/5427/7532/files/gta_5_cheat_codes_xbox_one.pdf
    • https://cdn.shopify.com/s/files/1/0432/8236/6629/files/61690254324.pdf
    • https://cdn.shopify.com/s/files/1/0429/8113/0394/files/jowipomigasowakumeso.pdf
    • https://cdn.shopify.com/s/files/1/0434/1222/6206/files/76154461142.pdf
    • https://cdn.shopify.com/s/files/1/0434/3755/5868/files/9542051291.pdf
    • https://cdn.shopify.com/s/files/1/0431/9766/1348/files/82305116486.pdf
    • https://cdn.shopify.com/s/files/1/0432/3393/5515/files/vudezivopipuge.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ca5.bin
32ca5030562fc8b0bd554d5188fd33805268826b3860be6e44bd7312fb89f998		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CA5 5496 bytes
font_01_sfnt_off00005f45.bin
447888af39debf53befb02a8c47f152599ab45fcb8da05aabcb2861bbea64c18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F45 10848 bytes

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