Malicious PDF — malware analysis report

Static analysis result for SHA-256 52a49405800c1b4f…

MALICIOUS

PDF

43.1 KB Created: 2020-08-04 23:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8137639f7288322f7fca294c35731cd SHA-1: 3873c1addc119d7e28741fd982b3546a6f3d0e4e SHA-256: 52a49405800c1b4fce8155697c7cb51e6a95e55c004404cfb62f1b86340007d3
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to what appears to be a link farm designed to improve search engine rankings. One prominent link, https://ttraff.ru/pify?keyword=biological+control+of+insect+pests+and+weeds+pdf, is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to redirect users to malicious infrastructure under the guise of providing a PDF on pest control. No scripts were extracted from this sample.

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=biological+control+of+insect+pests+and+weeds+pdf
    • http://guzujof.dicksbook.net/uploads/1/3/0/8/130874207/xozuwugotud.pdf
    • http://files.monticellosmarket.com/uploads/1/3/2/7/132740552/gagilofidowaro_rapunevukopitor.pdf
    • http://files.moriskyscale.com/uploads/1/3/0/8/130874408/ruvamugenam-wajozamijipe-gufatidin-wetekegipamin.pdf
    • http://gekatex.strips.ie/uploads/1/3/0/7/130739590/fudekoxamabaro.pdf
    • http://nojepi.beautythebookandtheblog.com/uploads/1/3/1/0/131070722/d88cdb93dc4bbe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/38608120386.pdf
    • https://cdn.shopify.com/s/files/1/0433/6405/7247/files/bibagugox.pdf
    • https://cdn.shopify.com/s/files/1/0433/9364/6753/files/27959653426.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gozoba.pdf
    • https://cdn.shopify.com/s/files/1/0430/8385/8073/files/nukidilu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1928/0288/files/41992086224.pdf
    • https://cdn.shopify.com/s/files/1/0428/3708/2271/files/26645296185.pdf
    • https://cdn.shopify.com/s/files/1/0436/0319/8116/files/dubaxigafo.pdf
    • https://cdn.shopify.com/s/files/1/0437/5012/9813/files/59461094371.pdf
    • https://cdn.shopify.com/s/files/1/0432/1237/4174/files/heavy_mageweave_bandage.pdf
    • https://cdn.shopify.com/s/files/1/0431/1387/3569/files/66696719297.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_off00006a71.bin
a561be5044f02274c6b63075f1fdc9abb45d7f6f371e614c3d98b63b2f2c397e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A71 5464 bytes
font_01_sfnt_off00007d2f.bin
653b352684a5a7ab8e111eaaa66ada9a288e889d7996aa1dc833a0fc65f36c23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D2F 10012 bytes

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