Malicious PDF — malware analysis report

Static analysis result for SHA-256 f59c77a37ec1239c…

MALICIOUS

PDF

50.7 KB Created: 2020-08-25 17:40:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a99a8533e9a942910d53d0b59f3696a SHA-1: 473b62f6df265024f063086416ee4301a8429922 SHA-256: f59c77a37ec1239c94e0a0835a8d20e0062703ae243f29feec4957e3f6c9fa18
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a specific malicious redirector URL, indicating a phishing or scam attempt. The document body, though heavily obfuscated, contains the same malicious URL. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be a deceptive link leading to a redirector.

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=lg+g6+software+update+android+9
    • http://files.kalispellkindersandmore.com/uploads/1/3/0/7/130739470/e3ec63.pdf
    • http://files.riverstonegallery.net/uploads/1/3/1/8/131856121/7624272.pdf
    • https://cdn.shopify.com/s/files/1/0437/7732/7265/files/24870254579.pdf
    • https://cdn.shopify.com/s/files/1/0433/9829/9813/files/7071114737.pdf
    • https://cdn.shopify.com/s/files/1/0434/4283/1522/files/11793486772.pdf
    • https://cdn.shopify.com/s/files/1/0429/2732/5343/files/letoxo.pdf
    • https://cdn.shopify.com/s/files/1/0432/5444/8286/files/pukinigogojoked.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/xusuza.pdf
    • https://cdn.shopify.com/s/files/1/0434/8382/4294/files/63185753331.pdf
    • https://cdn.shopify.com/s/files/1/0430/3391/9645/files/81020347734.pdf
    • https://cdn.shopify.com/s/files/1/0455/4273/6037/files/all_dog_breeds_with_pictures_and_names.pdf
    • https://cdn.shopify.com/s/files/1/0437/4121/6919/files/82246498898.pdf
    • https://cdn.shopify.com/s/files/1/0457/5549/8652/files/96_movie_tamilplay.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_off000085ab.bin
ca42726d07413510a2f32a6eec6e864c9e5243ea4e2b21a678e0dc18a4ed1dea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85AB 5520 bytes
font_01_sfnt_off0000988f.bin
716f05d770a5120eebbeff1966e46414bc968ca7bf885a31026c2530ae12ff18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x988F 10940 bytes

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