Malicious PDF — malware analysis report

Static analysis result for SHA-256 bce6941d94ced109…

MALICIOUS

PDF

50.9 KB Created: 2020-08-06 02:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2f11fb786ac68706e5473329f597072 SHA-1: ff39396c6aac27d2bfb37d4557d6c4ee6275f827 SHA-256: bce6941d94ced109d762f09207ebd85b29e354fe5d5e9e19926fc7a0ef251616
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to 'bitsat syllabus weightage pdf' and the malicious URL, suggesting a lure to download or view academic content. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, further supporting the malicious intent of directing users to external sites.

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=bitsat+syllabus+weightage+pdf
    • http://files.fyldecoastrunners.com/uploads/1/3/1/4/131438604/5ac7903.pdf
    • http://files.lindsayvickery.com/uploads/1/3/1/3/131380213/papujile-gugapuzugajenif-bugilaruxipubes.pdf
    • http://files.atxsandlot.com/uploads/1/3/1/4/131437064/8126739.pdf
    • http://files.ndafc.com/uploads/1/3/1/6/131606397/walek-voxoj-pokupax.pdf
    • https://cdn.shopify.co
    • https://cdn.shopify.com/s/files/1/0435/1302/0570/files/19268667708.pdf
    • https://cdn.shopify.com/s/files/1/0429/1562/7175/files/wetomoz.pdf
    • https://cdn.shopify.com/s/files/1/0435/2576/7320/files/86766985494.pdf
    • https://cdn.shopify.com/s/files/1/0432/6473/7448/files/final_fantasy_1_psp_cwcheat_codes.pdf
    • https://cdn.shopify.com/s/files/1/0429/4311/9516/files/fedixenawupugeb.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/65545430121.pdf
    • https://cdn.shopify.com/s/files/1/0433/4492/0734/files/21827779873.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nosisuzamozozi.pdf
    • https://cdn.shopify.com/s/files/1/0433/8368/5270/files/rovarazuretob.pdf
    • https://cdn.shopify.com/s/files/1/0434/2520/2332/files/environmental_tech_void_ore_miner.pdf
    • https://cdn.shopify.com/s/files/1/0427/5575/2103/files/nusagozap.pdf
    • https://cdn.shopify.com/s/files/1/0431/8229/3151/files/jixasapoxasedetika.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bararilisubolubudikolumo.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_off000087be.bin
e764d6376f3f3ab75ce5668fa1a1d6ef2f9f774825af0ccf0c90fef9253a3de6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87BE 5588 bytes
font_01_sfnt_off00009ad7.bin
cb9e0193725b76098221183abfbb7f21ef95510f9ba6eed933dd5af03f56a6e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AD7 10448 bytes

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