Malicious PDF — malware analysis report

Static analysis result for SHA-256 c09f605c9f0e2309…

MALICIOUS

PDF

44.5 KB Created: 2020-08-13 23:25:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14488284f3da9f13e6f477e147aa475b SHA-1: ae2d0f466a43048f56d0620c3ef6e845b4ad0013 SHA-256: c09f605c9f0e23095fa85cd35813e27700d513c3c5d913382c896a8f83aa4973
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a critical heuristic for linking to known malicious redirector infrastructure and for containing a large link farm. The embedded URLs, such as https://ttraff.ru/wb?keyword=future%20tense%20worksheets%20esl, likely serve as lures to phishing or malware download sites. 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/wb?keyword=future%20tense%20worksheets%20esl
    • http://files.firefallseffects.com/uploads/1/3/1/3/131379115/4660776.pdf
    • http://files.nauakablehands.com/uploads/1/3/0/8/130874046/9368856.pdf
    • http://files.snap-happy.net/uploads/1/3/0/8/130874585/bawawuwap-vazefaxiloji-famupewigoxipe-kegofaboxiwupu.pdf
    • http://files.trancityevent.com/uploads/1/3/1/4/131483267/zamuvemadabov.pdf
    • http://piwipupo.petraits.ca/uploads/1/3/1/3/131383708/wuminivulimap-birejopebalut-purajobapeg-tonoja.pdf
    • https://cdn.shopify.com/s/files/1/0432/9376/9894/files/dixujusej.pdf
    • https://cdn.shopify.com/s/files/1/0429/8165/4679/files/adverbs_worksheet_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/8206/3777/files/culture_of_animal_cells.pdf
    • https://cdn.shopify.com/s/files/1/0431/6495/8879/files/how_to_save_imovie_project.pdf
    • https://cdn.shopify.com/s/files/1/0432/6470/4665/files/9988291088.pdf
    • https://cdn.shopify.com/s/files/1/0431/8016/3227/files/gufaruser.pdf
    • https://cdn.shopify.com/s/files/1/0427/8134/3903/files/dedinomemexido.pdf
    • https://cdn.shopify.com/s/files/1/0435/5283/3687/files/4229183439.pdf
    • https://cdn.shopify.com/s/files/1/0444/3511/2103/files/cae_gold_exam_maximiser_key.pdf
    • https://cdn.shopify.com/s/files/1/0431/9127/1586/files/subtracting_fractions_worksheets_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wozofedotomutigetipire.pdf
    • https://cdn.shopify.com/s/files/1/0432/8236/6629/files/mowegaxopot.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006305.bin
a5e82ebe7d200aea8644476d553939a4fe644c21b8519a00fcb0c6db6b17fc6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6305 4508 bytes
font_01_sfnt_off0000725f.bin
e0420dad4a680bacf9159348302f1d7ec51f5fd1f094e1ccf3882374e6b38d1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x725F 10756 bytes
font_02_sfnt_off000096f9.bin
ad623bc7c681097dfa1224999cf6cc6072d3ca9a137655dc1129b0261f0b357c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96F9 4324 bytes

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