Malicious PDF — malware analysis report

Static analysis result for SHA-256 4911d4f77b627934…

MALICIOUS

PDF

41.7 KB Created: 2020-08-05 23:57:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fe8d3f659617d65aabe11dbe8ae4e1d SHA-1: cd2e55cf5b6a529b96da80f23946b75e15cc7a48 SHA-256: 4911d4f77b627934e0638753329f21a904887d1702d031f9b667be5b095096e2
152 Risk Score

Malware Insights

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

The PDF document is identified as malicious due to its structure containing a large number of embedded links, a technique often used for SEO poisoning or to redirect users to malicious sites. The primary redirector URL, 'https://ttraff.com/pify?keyword=asme+section+viii+division+1+2020+pdf+download', is flagged as malicious. The document body, while containing garbled text, also includes this redirector URL, reinforcing the malicious intent. The presence of numerous links, many pointing to benign Shopify domains but likely part of a link farm, suggests a lure to disguise the malicious redirector.

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=asme+section+viii+division+1+2020+pdf+download
    • http://files.bsmcmilehighchapter5280.com/uploads/1/3/2/6/132681342/8028670.pdf
    • http://vulekukam.withouthindrance.com/uploads/1/3/1/4/131438641/balupadusipaz_solidubejetokek.pdf
    • http://files.summitorthosports.com/uploads/1/3/1/3/131398250/05e5a.pdf
    • http://fojuge.rowenglenkennels.com/uploads/1/3/0/7/130776611/3994066.pdf
    • https://cdn.shopify.com/s/files/1/0429/3384/6175/files/topugabetanumexeb.pdf
    • https://cdn.shopify.com/s/files/1/0437/7991/5937/files/cost_accounting_syllabus_2020.pdf
    • https://cdn.shopify.com/s/files/1/0434/4968/0028/files/16175949661.pdf
    • https://cdn.shopify.com/s/files/1/0434/0023/3112/files/51182294734.pdf
    • https://cdn.shopify.com/s/files/1/0437/3820/2273/files/faragufitodovip.pdf
    • https://cdn.shopify.com/s/files/1/0429/0789/3919/files/43891080434.pdf
    • https://cdn.shopify.com/s/files/1/0431/7832/8221/files/fuvumebulebomexidarabume.pdf
    • https://cdn.shopify.com/s/files/1/0428/2312/3100/files/fojivanomazosi.pdf
    • https://cdn.shopify.com/s/files/1/0446/1743/3251/files/romania_tv_live.pdf
    • https://cdn.shopify.com/s/files/1/0431/8396/4324/files/7303046015.pdf
    • https://cdn.shopify.com/s/files/1/0440/8279/0552/files/how_to_convert_wma_to_mp3.pdf
    • https://cdn.shopify.com/s/files/1/0433/5583/2469/files/dungeon_master_s_guide_1979.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063a9.bin
5d07b60f4a944c26346b7be8311c772a9302fcaee7908da7d0fcbf0fa695c7c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63A9 5672 bytes
font_01_sfnt_off00007709.bin
9cb88026d436385538a1e86639b2507b36fa6f3aaa0edff31d4ddfc5c37fb5e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7709 10144 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.