Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dff9cf40d885a0b…

MALICIOUS

PDF

36.4 KB Created: 2020-08-07 07:15:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 080d3c801760f02666af8fd1fc687308 SHA-1: bcdbac22b83725c0b2309ca7b273fa7f314c5acf SHA-256: 4dff9cf40d885a0b25847b20d1156a32147b2d35e91207328c879501d90a6cba
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large number of external PDF links, indicative of an SEO link farm. The embedded URL 'https://ttraff.cc/pify?keyword=bm+sharma+physics+pdf+jee+main' is identified as a malicious redirector. The document body contains obfuscated text and the same URL, further supporting the malicious intent of directing users to potentially harmful content.

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.cc/pify?keyword=bm+sharma+physics+pdf+jee+main
    • http://files.nepalrtdc.org/uploads/1/3/0/7/130775197/8757304.pdf
    • http://files.soniawilliamsart.com/uploads/1/3/0/8/130814387/fevaki-vevurel-tubuxebu.pdf
    • http://files.rgrahamoliver.com/uploads/1/3/0/9/130969059/6176813.pdf
    • http://files.psuvita.org/uploads/1/3/1/0/131071041/lusima-jolovi-tuvugomemuzi-wakunalibapuxo.pdf
    • http://files.centerstageboutiquetx.com/uploads/1/3/0/8/130813972/7362989.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tikifulodu.pdf
    • https://cdn.shopify.com/s/files/1/0428/3429/6988/files/toduvizemebu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3537/7307/files/pureragazaxamavegexu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6404/1365/files/download_youtube_video_audio.pdf
    • https://cdn.shopify.com/s/files/1/0431/3497/6157/files/zidefi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3459/0882/files/craigslist._org_norfolk_va.pdf
    • https://cdn.shopify.com/s/files/1/0431/1567/5815/files/rome_2_patch_18.pdf
    • https://cdn.shopify.com/s/files/1/0432/2571/0750/files/37983583139.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rejupabofutub.pdf
    • https://cdn.shopify.com/s/files/1/0437/3276/2785/files/65481865136.pdf
    • https://cdn.shopify.com/s/files/1/0432/5271/1581/files/gasovarurivakekinaxoneva.pdf
    • https://cdn.shopify.com/s/files/1/0433/7877/0076/files/volamo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vukabisozudetilo.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_off00004e25.bin
c9084a009b9c00a09584e1fc95712d5b5c0fb0261ee9115b36ad5699720c2516		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E25 5588 bytes
font_01_sfnt_off0000610f.bin
6f93a270ef65630671187795186a5e2f6b7600f92022e5a3001fbf8cce76be0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x610F 10724 bytes

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