Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bf2c86b0c28d47d…

MALICIOUS

PDF

55.0 KB Created: 2020-08-09 03:41:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18f5d015d544620d48002faa88156ab0 SHA-1: 4375e428e17fb7686df25b4d7d60726bf8434933 SHA-256: 0bf2c86b0c28d47d954f48e9a9c8a8ab78ba52d40d92ba42c02dcb629c5fd8ca
154 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to a job application and a URL that appears to be part of a link farm designed to attract search engine traffic. The primary malicious URL identified is ttraff.cc, which is used to redirect users to other 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=job+application+form+pdf+sri+lanka
    • http://files.lovesocialcafe.com/uploads/1/3/0/8/130874276/8290257.pdf
    • http://files.eastcoastinferno.com/uploads/1/3/1/6/131636602/e5787da542.pdf
    • http://files.univerdant.com/uploads/1/3/1/8/131871569/85c677fa73.pdf
    • http://nitinu.volks-retail-llc.com/uploads/1/3/0/9/130969723/bamavu.pdf
    • http://xebizavug.watkinsdeals.com/uploads/1/3/1/8/131856772/zenivemetob.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8575/8617/files/zoduwoj.pdf
    • https://cdn.shopify.com/s/files/1/0434/1517/5317/files/branchement_interrupteur_va_et_vient_en_simple_allumage.pdf
    • https://cdn.shopify.com/s/files/1/0432/9419/5870/files/danilolovisalu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3106/files/zejiwetipo.pdf
    • https://cdn.shopify.com/s/files/1/0429/5327/7589/files/taxan.pdf
    • https://cdn.shopify.com/s/files/1/0430/0334/7097/files/89617525245.pdf
    • https://cdn.shopify.com/s/files/1/0436/0280/4898/files/70169695558.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sazofafusogowo.pdf
    • https://cdn.shopify.com/s/files/1/0432/5870/8118/files/madenudagulupemumojurow.pdf
    • https://cdn.shopify.com/s/files/1/0434/4774/6721/files/zezepavusulumikatosaramul.pdf
    • https://cdn.shopify.com/s/files/1/0437/2175/2726/files/pifonimosijewalevejaraxi.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
    • http://sinhala.sourceforge.net/
    • http://sinhala.cvs.sourceforge.net/viewvc/*checkout*/sinhala/sinhala/fonts/CREDITS
    • http://www.gnu.org/licenses/gpl-2.0.html

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007683.bin
8a584fa93494b55eb1d7c59e7ce5be00b6247723b742fe0122d5cd1091cf62e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7683 5492 bytes
font_01_sfnt_off000088dd.bin
92780cf7624a6d7aaecd03fbba4a611bc1f5b73878669a601006dddf56133516		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88DD 12856 bytes
font_02_sfnt_off0000aa18.bin
82630377325ef0fffec0bba793c3f7deefd6de08e6f8edc340a70c89894130bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA18 10048 bytes

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