Malicious PDF — malware analysis report

Static analysis result for SHA-256 a41f81c000ce561e…

MALICIOUS

PDF

50.6 KB Created: 2020-08-06 07:41:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13a7486846e4036c74990b77e39c604b SHA-1: 2adda06537b994f25c051a5c16cfb4be0912f7b4 SHA-256: a41f81c000ce561e892913968b51ffe9bd3024b32c243adc803c9d903de53985
152 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and contains numerous embedded links. One critical heuristic identified a link to a known malicious redirector, ttraff.com, which is likely used to funnel users to malicious sites. The document body itself is heavily obfuscated but contains the same redirector URL, suggesting it is the primary lure. The presence of a mass external PDF link farm further supports the malicious intent of distributing traffic to potentially harmful destinations.

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=beethoven+piano+sonata+14+pdf
    • http://files.uckfielddivas.org/uploads/1/3/1/4/131453253/1439911.pdf
    • http://files.chipgeorgia.com/uploads/1/3/1/6/131606330/kilidasor-banudamumo-tewudu-sigipuzaxaja.pdf
    • http://files.toddkongart.com/uploads/1/3/1/4/131406104/9bd8d9.pdf
    • http://files.capescottandthenorthcoasttrail.com/uploads/1/3/1/4/131437655/sofafu.pdf
    • http://files.healmylifemobile.com/uploads/1/3/2/6/132683001/tebed-posabod-furedelunifub.pdf
    • https://cdn.shopify.com/s/files/1/0431/5247/4267/files/amicalola_falls_map.pdf
    • https://cdn.shopify.com/s/files/1/0434/4751/7341/files/91800866049.pdf
    • https://cdn.shopify.com/s/files/1/0430/4669/9165/files/dususodirozivoxavapujupu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7260/1756/files/17221018757.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/botudurodakokebavexosox.pdf
    • https://cdn.shopify.com/s/files/1/0432/6916/1110/files/fefijinazuxuritadega.pdf
    • https://cdn.shopify.com/s/files/1/0441/4432/8856/files/tasorojegoroxudopi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3462/3643/files/fuwedivazekarudefa.pdf
    • https://cdn.shopify.com/s/files/1/0430/9378/6791/files/18060567692.pdf
    • https://cdn.shopify.com/s/files/1/0432/2571/0756/files/letebavipeko.pdf
    • https://cdn.shopify.com/s/files/1/0430/3834/3322/files/sivevotos.pdf
    • https://cdn.shopify.com/s/files/1/0438/7130/5896/files/99191018234.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_off00007215.bin
52d9e66abd7e00c63537382d6d4611eec20d849dce4a14d2f5489c85eb124bc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7215 5248 bytes
font_01_sfnt_off00008408.bin
534ad3fbe140d30b1e3e0b1cdb2eb591374362b9771b616ea8e1715c70716503		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8408 10608 bytes
font_02_sfnt_off0000a864.bin
46d9b83afd797048ab251ddfc9ca9a6db44f3280724c231f6a80a061bcc6fc12		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA864 16120 bytes

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