Malicious PDF — malware analysis report

Static analysis result for SHA-256 754089e1141f513f…

MALICIOUS

PDF

59.7 KB Created: 2020-08-24 21:22:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 012466af2dcb34385da917c745968598 SHA-1: 218adc5965a74de8a9d0d816889be6f44f6ea61b SHA-256: 754089e1141f513f17ab35ce825d522b7d5e04a839cd0d3d1d14fb4634348b55
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 benign Shopify URLs, but one critical link directs to a known malicious redirector. This suggests the document is part of an SEO link farm designed to lure unsuspecting users to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF.

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=ccna+2+chapter+4+answers+2019
    • http://files.flooringnetwork.com/uploads/1/3/2/6/132681409/numedegamidu-fukusox-wovofukemipe.pdf
    • http://files.stjuliastc.com/uploads/1/3/2/7/132740619/2776946.pdf
    • http://files.musicwithmrshatch.com/uploads/1/3/0/7/130776791/xarinuz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/6921/0773/files/wipisizenenen.pdf
    • https://cdn.shopify.com/s/files/1/0437/3653/1095/files/multiples_worksheets_grade_5.pdf
    • https://cdn.shopify.com/s/files/1/0428/8161/3987/files/capabilities_of_computer.pdf
    • https://cdn.shopify.com/s/files/1/0431/3877/7249/files/picsart_editor_for_pc.pdf
    • https://cdn.shopify.com/s/files/1/0430/8677/4436/files/38943969275.pdf
    • https://cdn.shopify.com/s/files/1/0432/2865/9874/files/appendicitis_complications.pdf
    • https://cdn.shopify.com/s/files/1/0432/3098/6400/files/poxamemotasolurena.pdf
    • https://cdn.shopify.com/s/files/1/0431/5555/4455/files/47155513972.pdf
    • https://cdn.shopify.com/s/files/1/0431/2947/1130/files/2227193317.pdf
    • https://cdn.shopify.com/s/files/1/0437/8941/8647/files/lagu_atmosfera_berakhirlah_sudah_lirik.pdf
    • https://cdn.shopify.com/s/files/1/0431/4133/3147/files/wogavejixesigukitegis.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_off0000a525.bin
8c558bfa1fd58a2630bb94dcdc9eba1ec23b39f9d09d5cc5d13bc392d3669382
pdf-font-stream PDF embedded font (sfnt) at offset 0xA525 5556 bytes
font_01_sfnt_off0000b80e.bin
ddb35b21fa23a90a4cd7ebe4b9744019a9c03e3cf0008bf22aa217caa2b1fda2
pdf-font-stream PDF embedded font (sfnt) at offset 0xB80E 12984 bytes