Malicious PDF — malware analysis report

Static analysis result for SHA-256 03979e5c1561bf11…

MALICIOUS

PDF

34.9 KB Created: 2020-08-08 22:38:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c1ac906f0a573a55ed492aed86255e7 SHA-1: c0563e5ddc097e741b3d15f26e2c68c5702f1118 SHA-256: 03979e5c1561bf116c40f9c01ef3f5aa2a2f59fe1fd0b0ede65e2d6bc484b679
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, indicating a link farm for SEO manipulation or to distribute malicious content. One prominent link directs to a known malicious redirector infrastructure. 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=sensory+integration+theory+and+practice+pdf
    • http://files.hycartstudio.com/uploads/1/3/2/6/132681482/f57fb0.pdf
    • http://files.barbaramwebb.com/uploads/1/3/0/9/130969448/5925474.pdf
    • http://files.bonneygirlphotography.com/uploads/1/3/2/6/132681204/sapoxorufewodod.pdf
    • http://wezemun.teviotteastore.com/uploads/1/3/0/7/130776326/fotaziridozuk-paletilixazevaj-givilan.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/5251/4979/files/vikuxekoravena.pdf
    • https://cdn.shopify.com/s/files/1/0431/8406/2622/files/piwisupijofisemo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5119/6315/files/86059186755.pdf
    • https://cdn.shopify.com/s/files/1/0431/3343/6071/files/vadabadi.pdf
    • https://cdn.shopify.com/s/files/1/0433/4557/6088/files/74282448378.pdf
    • https://cdn.shopify.com/s/files/1/0430/6134/6466/files/65123294863.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/67331216746.pdf
    • https://cdn.shopify.com/s/files/1/0434/3214/9148/files/61523929969.pdf
    • https://cdn.shopify.com/s/files/1/0432/2315/4850/files/rca_voyager_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mudamizoxudaxusuzo.pdf
    • https://cdn.shopify.com/s/files/1/0431/7069/3284/files/betaxewenamiledo.pdf
    • https://cdn.shopify.com/s/files/1/0428/3056/1436/files/13735734384.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004745.bin
d8636e2b904d84755b14b81d78cc7600799f59e3677bfedf369f04f151cf1e54
pdf-font-stream PDF embedded font (sfnt) at offset 0x4745 5592 bytes
font_01_sfnt_off00005a4d.bin
7fab84410232a4c66e3e5f0e015e192fc88c890172e6ffe2799809344399c042
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A4D 10180 bytes