Malicious PDF — malware analysis report

Static analysis result for SHA-256 68983a647403946c…

MALICIOUS

PDF

37.1 KB Created: 2020-08-20 00:09:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 78f7db8edab1775be459781f57877958 SHA-1: 96f0380ccde401bf3b0f0c08954e3ea4bde19d9b SHA-256: 68983a647403946c0c158e94364394a0884fca867b143a0b3a54ebb89971ecf2
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 Shopify domains hosting other PDFs, but one key link redirects to a known malicious infrastructure at 'ttraff.ru'. This suggests a link farm or SEO poisoning tactic designed to funnel users to malicious content. The ML classifier also strongly indicated maliciousness.

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=preterite+vs+imperfect+worksheet+with+answers+pdf
    • http://dulatira.artfullivingmovement.com/uploads/1/3/1/3/131381679/371df86c4268.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/4854/1079/files/vedemekesiz.pdf
    • https://cdn.shopify.com/s/files/1/0429/6271/4773/files/types_of_isomerism_in_organic_chemistry.pdf
    • https://cdn.shopify.com/s/files/1/0433/8522/5372/files/lafutebim.pdf
    • https://cdn.shopify.com/s/files/1/0430/8677/4436/files/63657123012.pdf
    • https://cdn.shopify.com/s/files/1/0436/8872/2587/files/bel_canto_singing_technique.pdf
    • https://cdn.shopify.com/s/files/1/0448/0122/8951/files/ar_rahman_hits_songs_isaimini.pdf
    • https://cdn.shopify.com/s/files/1/0434/2117/1873/files/cartesian_to_vector_form_of_a_plane.pdf
    • https://cdn.shopify.com/s/files/1/0431/9641/6161/files/91535350047.pdf
    • https://cdn.shopify.com/s/files/1/0430/3749/1354/files/movidiwunogedari.pdf
    • https://cdn.shopify.com/s/files/1/0440/1269/9798/files/90058547681.pdf
    • https://cdn.shopify.com/s/files/1/0429/1392/3228/files/marriage_certificate_request_form_maryland.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004674.bin
b61ad9e9f3c3b1d318a27c6ed89bf91e0c9fdaac80ef216a846c40020f4d0d04
pdf-font-stream PDF embedded font (sfnt) at offset 0x4674 5368 bytes
font_01_sfnt_off00005896.bin
39bea3ecf0acbde42a042e9dcb0b960ebf17f63ff3c4136816fa20a7e7feadd6
pdf-font-stream PDF embedded font (sfnt) at offset 0x5896 9576 bytes
font_02_sfnt_off00007969.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x7969 4324 bytes