Malicious PDF — malware analysis report

Static analysis result for SHA-256 38c241a0dbf13a72…

MALICIOUS

PDF

75.8 KB Created: 2020-07-30 08:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9f6db6f73e8d5de21436655ec056be0 SHA-1: 36f5bb89156c598d28e3f448ff4c95cad25c2af3 SHA-256: 38c241a0dbf13a72b6e1c0e61ea52c1d5c158c1e3205f4962922896c029cab3c
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits a PDF link farm with numerous external links, many hosted on Shopify, suggesting an attempt to obscure the malicious destination or engage in SEO manipulation for broader reach. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of a malicious redirector URL is sufficient to infer a phishing or malware distribution attempt.

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=sand+casting+process+pdf
    • http://files.beth-vickers.com/uploads/1/3/0/8/130813888/bca0f1019b8c.pdf
    • http://files.msjohnsonscienceclass.com/uploads/1/3/1/8/131871484/kezezubuxeb_nelodutudonesav_jediwotamumigu_nodoge.pdf
    • http://files.shallyns.com/uploads/1/3/1/3/131380592/d88bc826a3dcb24.pdf
    • http://files.mtproductskauai.com/uploads/1/3/1/1/131164488/pipog.pdf
    • http://files.ostler-moves.com/uploads/1/3/2/7/132740260/wotume_fudaxepofi_bobirug_kodolux.pdf
    • https://cdn.shopify.com/s/files/1/0435/5689/6927/files/31052741230.pdf
    • https://cdn.shopify.com/s/files/1/0432/3937/5012/files/lozatagijoviselaja.pdf
    • https://cdn.shopify.com/s/files/1/0432/6942/3269/files/negekudowamup.pdf
    • https://cdn.shopify.com/s/files/1/0429/7628/0729/files/97852664972.pdf
    • https://cdn.shopify.com/s/files/1/0434/0298/5622/files/54198130378.pdf
    • https://cdn.shopify.com/s/files/1/0430/9486/8122/files/18628390272.pdf
    • https://cdn.shopify.com/s/files/1/0429/5678/3772/files/xujojenen.pdf
    • https://cdn.shopify.com/s/files/1/0431/5440/7580/files/91191720558.pdf
    • https://cdn.shopify.com/s/files/1/0438/1632/1184/files/60140661482.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_off0000d866.bin
45136461b7c9f6856ce35904d914049e0fb12ad4cf970a85ad30f4d3d523b1c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD866 5184 bytes
font_01_sfnt_off0000ea00.bin
47b9b37e94a98784dd4090eae6d6c993d99fa23b4a97e7c77de80987bac9aac4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA00 10108 bytes
font_02_sfnt_off00010cb3.bin
d6f94c0e078b7a5833ee365886fa7586bc2cf9ca7297a019ee1beca532418f3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB3 16116 bytes

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