Malicious PDF — malware analysis report

Static analysis result for SHA-256 3edc38aedb20b00e…

MALICIOUS

PDF

36.4 KB Created: 2020-08-06 05:20:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09ab041f4e2a4f9c808da8b679885a67 SHA-1: 78fd1d14b9dd4632828ed54b2ebc41d74dc98e4c SHA-256: 3edc38aedb20b00ea2fff849ac69667b0528b91b9464a518000d3b61435faebb
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a link farm hosted on Shopify. One critical heuristic identified a link to a known malicious redirector infrastructure at 'ttraff.ru'. The document body, though partially corrupted, contains text that appears to be a lure for academic content, likely to disguise the malicious links. No scripts were extracted from this sample.

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/pify?keyword=an+introduction+to+the+calculus+of+variations+fox+pdf
    • http://files.garystepanek.com/uploads/1/3/0/7/130775588/wegamimu.pdf
    • http://files.thecastlespa.co.uk/uploads/1/3/2/6/132696111/gobupekiw_renakalalufuful.pdf
    • http://kutivid.baldyviewdrivingschool.com/uploads/1/3/2/6/132696212/rozoxukumaxa.pdf
    • http://dagebag.cdrc.org/uploads/1/3/1/3/131380158/tesamexozaxis.pdf
    • https://cdn.shopify.com/s/files/1/0436/2783/9641/files/vaxezidusikudafilixem.pdf
    • https://cdn.shopify.com/s/files/1/0438/3087/0173/files/36418668942.pdf
    • https://cdn.shopify.com/s/files/1/0430/6491/8165/files/16342255828.pdf
    • https://cdn.shopify.com/s/files/1/0434/4047/2229/files/40061586558.pdf
    • https://cdn.shopify.com/s/files/1/0432/1270/1854/files/31303055024.pdf
    • https://cdn.shopify.com/s/files/1/0428/5143/4659/files/wupexumutokenagiririririk.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4885/files/70252841611.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/11067845032.pdf
    • https://cdn.shopify.com/s/files/1/0430/8644/6746/files/disarufofenakime.pdf
    • https://cdn.shopify.com/s/files/1/0431/3186/3202/files/fekobexi.pdf
    • https://cdn.shopify.com/s/files/1/0438/4456/7197/files/artificial_intelligence_in_education.pdf
    • https://cdn.shopify.com/s/files/1/0429/5809/4495/files/pufoxegomusanulewa.pdf
    • https://cdn.shopify.com/s/files/1/0427/4746/1788/files/49812599167.pdf
    • https://cdn.shopify.com/s/files/1/0434/7058/6006/files/76501785400.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_off0000510d.bin
ab92f7326c8498201e6ddce6363efdf59b8dd6aca0724e426881ebf43585ce3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x510D 5360 bytes
font_01_sfnt_off0000634a.bin
31d00b0ce97c8a07f964bafa0d7b039e730e851335bd3bcd8eaf9ea6f25b69ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x634A 9716 bytes

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