Malicious PDF — malware analysis report

Static analysis result for SHA-256 720ab9e8c18f20f1…

MALICIOUS

PDF

42.5 KB Created: 2020-08-29 18:03:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce651b3bb8150878bf3465eeb422ea51 SHA-1: 2aa96dd6adf7975eab7f0bb12f2b1f7e8be090ad SHA-256: 720ab9e8c18f20f1ae6b26444e218b9698483ac36b9904fb72fc709f228e1613
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL and appears to be a lure for a specific PDF title. The presence of numerous external links, many to Shopify, suggests an attempt to create a link farm or distribute content, with the primary malicious URL being the most critical IOC.

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/wix?keyword=top+notch+2+third+edition+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/6780/1749/files/zuxasuwomujuvenemufuj.pdf
    • https://cdn.shopify.com/s/files/1/0427/8039/3639/files/aficio_1113_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/3407/4523/files/26238446279.pdf
    • https://cdn.shopify.com/s/files/1/0438/5947/6630/files/22107588074.pdf
    • https://cdn.shopify.com/s/files/1/0430/7949/9940/files/stripe_test_cards.pdf
    • https://static.usrfiles.com/ugd/b8c837_5caa34744e3742ebaa30f1b18443d392.pdf
    • https://static.usrfiles.com/ugd/8b97dd_a9a79d645f6849189a64eef76489bc97.pdf
    • https://static.usrfiles.com/ugd/e02969_c0cf2d4c990949489bbc7abdbb86c16b.pdf
    • https://static.usrfiles.com/ugd/d01287_1d75fa74e168415ca2e81f131c3eea58.pdf
    • https://static.usrfiles.com/ugd/b8c837_37aef226025f4cdd8266251bce609cff.pdf
    • https://cdn.shopify.com/s/files/1/0428/6955/5356/files/20159781158.pdf
    • https://cdn.shopify.com/s/files/1/0430/9532/6887/files/87575984005.pdf
    • https://cdn.shopify.com/s/files/1/0435/4827/8935/files/inside_reading_1_answer_key_unit_3.pdf
    • https://cdn.shopify.com/s/files/1/0431/3032/3101/files/zaxuloretofizim.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/ropuxikasafomudixaxo.pdf
    • https://cdn.shopify.com/s/files/1/0430/4902/5690/files/54784903792.pdf
    • https://cdn.shopify.com/s/files/1/0432/3645/8654/files/vufutefajeruzuzisubiroju.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_off0000685c.bin
1f58f0fdd2bece22c69f8267d47f8a3b832810a643ea6d4f1fde4c783172069d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x685C 4904 bytes
font_01_sfnt_off00007906.bin
6df97e66cf6f11245de357d863e6cb26755a763aded24bcb0174d0e37a05f6d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7906 11176 bytes

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