Malicious PDF — malware analysis report

Static analysis result for SHA-256 c37fdc351dcda62c…

MALICIOUS

PDF

64.4 KB Created: 2020-08-11 07:36:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e68e6689081f7d69e3580e466b54c3d1 SHA-1: 9f9011475ee61a85e707b55f9edf40c9258e410a SHA-256: c37fdc351dcda62c47a497a93273e9dfcb278e2beadb8d9845e87204150853f2
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=af+soomaali+fasalka+8aad+pdf', which is flagged as malicious. The presence of a link farm suggests an attempt to manipulate search engine results or distribute content broadly. 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.com/pify?keyword=af+soomaali+fasalka+8aad+pdf
    • http://files.writinganswers.net/uploads/1/3/0/9/130969472/jadomomaranujesu.pdf
    • http://files.scheriegates.org/uploads/1/3/0/7/130738912/munosesewor_viropiguxasonuf.pdf
    • http://files.katikatiponyclub.com/uploads/1/3/2/6/132696414/xofimuj-wepuwax-vavap.pdf
    • https://cdn.shopify.com/s/files/1/0430/7946/7170/files/rival.pdf
    • https://cdn.shopify.com/s/files/1/0430/2556/3799/files/autodwg_to_dwg_converter_2020_registration_code.pdf
    • https://cdn.shopify.com/s/files/1/0434/9722/6402/files/25681537495.pdf
    • https://cdn.shopify.com/s/files/1/0433/9118/9157/files/82680632674.pdf
    • https://cdn.shopify.com/s/files/1/0439/2851/8824/files/voguwosutiwifudol.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gowavofopinesifaremoka.pdf
    • https://cdn.shopify.com/s/files/1/0431/8678/2369/files/17150238790.pdf
    • https://cdn.shopify.com/s/files/1/0432/7741/8656/files/6270698825.pdf
    • https://cdn.shopify.com/s/files/1/0438/2264/5408/files/anatomy_of_ruminant_digestive_system.pdf
    • https://cdn.shopify.com/s/files/1/0428/4982/9023/files/86795602155.pdf
    • https://cdn.shopify.com/s/files/1/0432/0018/4477/files/ccna_routing_and_switching_lab_workbook_200_125.pdf
    • https://cdn.shopify.com/s/files/1/0431/6332/0469/files/7957294807.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kuzizurogepibisomagin.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_off0000a911.bin
08f71c46fa3b34a2016de2fd515810075d20d0f83b9b5e422e61e5e03bc7db33		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA911 4824 bytes
font_01_sfnt_off0000b96a.bin
7a9058f6c78fa8623f95c55680e3981caedacc6641e7d94f4bb6c398d25cb657		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB96A 14252 bytes
font_02_sfnt_off0000e613.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE613 4324 bytes

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