Malicious PDF — malware analysis report

Static analysis result for SHA-256 40fbfafae157a82d…

MALICIOUS

PDF

52.2 KB Created: 2020-08-11 00:58:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 197a773c23f5e84edb3498080b023ccd SHA-1: 1b867c8dd07f12de5b28ff3504a6ba534824234e SHA-256: 40fbfafae157a82df6bff2532206d829f613cfd940df61a2ad8694460626ce6c
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=jnu+admission+result+a+unit+pdf'. The document body, though heavily obfuscated, contains references to admission results and URLs, reinforcing the lure. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm designed to improve search engine ranking for malicious content. 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=jnu+admission+result+a+unit+pdf
    • http://files.softcinch.com/uploads/1/3/0/8/130874317/cb02f36.pdf
    • http://files.carolynhart.com/uploads/1/3/1/4/131407364/22e30e.pdf
    • http://files.natashaemilymedium.com/uploads/1/3/0/8/130873869/xiresetedabutubusuw.pdf
    • https://cdn.shopify.com/s/files/1/0429/7788/6367/files/23126215174.pdf
    • https://cdn.shopify.com/s/files/1/0436/2380/9187/files/winnie_the_pooh_milne.pdf
    • https://cdn.shopify.com/s/files/1/0437/9122/0887/files/determination_of_organic_matter_in_soil.pdf
    • https://cdn.shopify.com/s/files/1/0429/1949/3785/files/8158644107.pdf
    • https://cdn.shopify.com/s/files/1/0430/7963/1012/files/95906489153.pdf
    • https://cdn.shopify.com/s/files/1/0433/5144/1563/files/75383816116.pdf
    • https://cdn.shopify.com/s/files/1/0430/2074/6906/files/rerezarevulelavejurapoje.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tokon.pdf
    • https://cdn.shopify.com/s/files/1/0439/2756/8552/files/english_short_story_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0430/3942/4669/files/xitolajegi.pdf
    • https://cdn.shopify.com/s/files/1/0432/0201/9487/files/capoeira_fighter_3_ultimate_world_tournament.pdf
    • https://cdn.shopify.com/s/files/1/0440/6244/1637/files/32439967368.pdf
    • https://cdn.shopify.com/s/files/1/0429/9282/8579/files/19080714560.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_off00006725.bin
80586d99e703af42a2fd38e753e18610ec929cc24c17a0d18c42116d35b2df36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6725 5176 bytes
font_01_sfnt_off000078a5.bin
54ade8e47337a5eb60a0ad826d4dc9bde578344620049c30b2c9759a95c007eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78A5 12656 bytes
font_02_sfnt_off00009fcc.bin
b480c1872ff6c8218f310c5c74680f983ff11e4f89e52741de6862cc08a43ba5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9FCC 10504 bytes

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