Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c4fb3d285cb3375…

MALICIOUS

PDF

59.4 KB Created: 2020-08-06 14:15:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5eda3418ad27b4de8db832addccc96b SHA-1: 60e50856bc63ddf1fbb7f9254973f4b7105f2a76 SHA-256: 5c4fb3d285cb337574e6ef8d8c39c9c5a7ce2d58c29bff8b568b212bec50351e
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, many pointing to Shopify domains hosting other PDFs, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the target search query 'nebosh igc 3 book pdf' and the malicious URL, suggesting a link farm or SEO poisoning tactic to drive traffic to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/wb?keyword=nebosh%20igc%203%20book%20pdf
    • http://files.lockdescape.com/uploads/1/3/0/8/130874237/c3b6b6.pdf
    • http://files.mrmamaslv.com/uploads/1/3/0/8/130814169/9161622.pdf
    • http://vuzibi.teatimewithnaomi.org/uploads/1/3/0/7/130738720/rujijow_vepekuzawuk_sizig.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6423/7992/files/vovarexezoduzemuta.pdf
    • https://cdn.shopify.com/s/files/1/0440/6041/0006/files/round_in_python.pdf
    • https://cdn.shopify.com/s/files/1/0436/8737/9094/files/caratheodory_theorem.pdf
    • https://cdn.shopify.com/s/files/1/0435/0869/5192/files/5246028978.pdf
    • https://cdn.shopify.com/s/files/1/0439/2180/1371/files/agility_guide_rs3.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/45292738862.pdf
    • https://cdn.shopify.com/s/files/1/0429/1048/2588/files/tifajisobaz.pdf
    • https://cdn.shopify.com/s/files/1/0432/5598/8374/files/47181628393.pdf
    • https://cdn.shopify.com/s/files/1/0439/1682/0635/files/74234546939.pdf
    • https://cdn.shopify.com/s/files/1/0429/3555/0119/files/lajonutigefugo.pdf
    • https://cdn.shopify.com/s/files/1/0438/9571/8040/files/47359864009.pdf
    • https://cdn.shopify.com/s/files/1/0434/5053/1990/files/41642100202.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aa08.bin
7c54084a5613d3626cd7417dcaf19b3f5b700049948fa5dfe3b3634fa3b70efa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA08 5416 bytes
font_01_sfnt_off0000bc83.bin
9735392e16684443ba75290d4617cb2ba7c03f34e0db6f5d29dc272f37e50d72		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC83 11028 bytes

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