Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bc143718a71d74e…

MALICIOUS

PDF

121.1 KB Created: 2020-08-09 09:08:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad04d2052a753e61d8185b659f3a8077 SHA-1: 9fe40119a29af4a0c16085e9365bfba6ce5e1e38 SHA-256: 5bc143718a71d74ef96d2d697364ad6388d85be88aff9a8b82d6dd57d2d1e597
154 Risk Score

Malware Insights

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

The PDF contains numerous links designed to mimic search results, leading to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure. The presence of many external links suggests a link farm or SEO poisoning attempt to drive traffic to malicious infrastructure.

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=thermal+conductivity+of+concrete+pdf
    • http://files.addictedtofitness.ky/uploads/1/3/0/7/130740092/37fd08ec42c38da.pdf
    • http://vuvawig.ericbjorgensen.com/uploads/1/3/0/9/130969060/0b7bbcdd1120.pdf
    • http://pomaj.dayleeosi.com/uploads/1/3/2/7/132740214/fiwadoja.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/4217/7181/files/devovopolevaxisor.pdf
    • https://cdn.shopify.com/s/files/1/0435/7187/1912/files/ruxitomufi.pdf
    • https://cdn.shopify.com/s/files/1/0433/7877/0078/files/jijekekef.pdf
    • https://cdn.shopify.com/s/files/1/0438/1576/4128/files/tekasufoxirakebapilod.pdf
    • https://cdn.shopify.com/s/files/1/0448/0276/9053/files/karnataka_state_budget_2020_in_kannada.pdf
    • https://cdn.shopify.com/s/files/1/0430/4715/7914/files/detofired.pdf
    • https://cdn.shopify.com/s/files/1/0429/4973/8650/files/miwoda.pdf
    • https://cdn.shopify.com/s/files/1/0430/8297/3346/files/puwuvubivuvedesenak.pdf
    • https://cdn.shopify.com/s/files/1/0433/4059/5355/files/70494854703.pdf
    • https://cdn.shopify.com/s/files/1/0435/5362/0136/files/fajanexawaxojosiwinegi.pdf
    • https://cdn.shopify.com/s/files/1/0430/6799/8362/files/cool_guy_meme.pdf
    • https://cdn.shopify.com/s/files/1/0433/4823/0297/files/compound_versus_simple_interest.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017464.bin
040351f82dd6a2c277444cde3c685cf9d37c6f05c058f59c538418e12c389ed9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17464 5328 bytes
font_01_sfnt_off00018663.bin
e2375a6798cd0ab361fd62e1f5cb9cd196584bb3a772be2880c060436a7b7d38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18663 18784 bytes
font_02_sfnt_off0001c123.bin
aef73d17beeb92c2c4521791873327b20a7a99ad6c5ee323edd35197c9e5b996		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C123 16288 bytes

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