Malicious PDF — malware analysis report

Static analysis result for SHA-256 78a8b7c5aac4db55…

MALICIOUS

PDF

49.7 KB Created: 2020-08-08 05:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1033432db0fd15651601ffb58b7d8ff0 SHA-1: 96641d22b3ef5bb749e90be5aa0df1459a52eec4 SHA-256: 78a8b7c5aac4db55211b24ae063f45973a64dd70c131f2245a03b760497b01fa
154 Risk Score

Malware Insights

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

The PDF contains embedded links that are identified as malicious redirectors, specifically pointing to 'ttraff.com'. The document body, though partially obfuscated, suggests a lure for a 'free download bhagavad gita telugu pdf'. The presence of numerous external PDF links, many of which are hosted on Shopify, indicates a link farm strategy. The ML classifier strongly flagged this PDF as malicious.

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.com/pify?keyword=free+download+bhagavad+gita+telugu+pdf
    • http://files.chinchinhorseboxbar.co.uk/uploads/1/3/1/4/131407918/diwuvezug-zojumuz.pdf
    • http://files.deepdixieclub.com/uploads/1/3/1/4/131437612/7eb0c36c623fa88.pdf
    • http://files.trieyecreative.com/uploads/1/3/0/8/130814535/8ccb385f7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0441/0392/5912/files/advertising_agency_startup_plan.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/tejowekelezodesirosi.pdf
    • https://cdn.shopify.com/s/files/1/0429/3387/8940/files/55604458822.pdf
    • https://cdn.shopify.com/s/files/1/0432/9901/2763/files/70024366405.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lipowu.pdf
    • https://cdn.shopify.com/s/files/1/0430/5915/1009/files/67406897732.pdf
    • https://cdn.shopify.com/s/files/1/0436/5369/3593/files/story_map_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0434/9765/2376/files/84620047464.pdf
    • https://cdn.shopify.com/s/files/1/0434/8212/0357/files/geometric_design_of_highways_nptel.pdf
    • https://cdn.shopify.com/s/files/1/0431/9795/6256/files/gukisiwibezedopepa.pdf
    • https://cdn.shopify.com/s/files/1/0437/1913/1285/files/basic_english_free_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004b04.bin
0cacc2e9fa2df7d748e0edf628da8206a7af9d34ba365e48e085e303ec267c44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B04 5372 bytes
font_01_sfnt_off00005d5d.bin
7c5521509720834d957c8ac904a679e8b15a22ca69eee03476fe4abb3bb763bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D5D 25368 bytes
font_02_sfnt_off000095f0.bin
fd77c1551a37afab15b43e0ff6720c78b03ac57dcae6d6b47cb298fb03f09e49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95F0 9520 bytes

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