Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b572ec1670d5719…

MALICIOUS

PDF

40.6 KB Created: 2020-08-22 02:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 289fd7b9ceea20dcf09421e306c90c5c SHA-1: 8f5cbd51e36e3de45e094fb4f26f18f58d8b65c4 SHA-256: 0b572ec1670d57198f982ea5bfd0627a458e66ae67c49da7fb1955a4e1e26571
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation. One prominent link, however, directs to a known malicious redirector. The document body contains text related to "Avg free for xp sp3" and a URL that appears to be a lure for this software, likely intended to trick users into clicking through 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.cc/pify?keyword=avg+free++for+xp+sp3
    • http://files.goodysimprints.net/uploads/1/3/2/6/132683017/damifupesaxemi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/0069/1868/files/niwewo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/38844241345.pdf
    • https://cdn.shopify.com/s/files/1/0431/6826/8456/files/riesgo_fisico_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0429/3810/6023/files/cadenas_de_markov_libro.pdf
    • https://cdn.shopify.com/s/files/1/0431/6463/1195/files/93672859118.pdf
    • https://cdn.shopify.com/s/files/1/0427/4041/6678/files/45750201482.pdf
    • https://cdn.shopify.com/s/files/1/0433/9158/2357/files/19806655003.pdf
    • https://cdn.shopify.com/s/files/1/0434/9073/8328/files/14102611797.pdf
    • https://cdn.shopify.com/s/files/1/0436/3055/9390/files/mathematics_for_economic_analysis_sydsaeter.pdf
    • https://cdn.shopify.com/s/files/1/0430/7622/3129/files/58799961193.pdf
    • https://cdn.shopify.com/s/files/1/0430/7750/1079/files/artificial_neural_networks_tutorials_point.pdf
    • https://cdn.shopify.com/s/files/1/0433/1218/5494/files/rinivut.pdf
    • https://cdn.shopify.com/s/files/1/0440/8298/7158/files/29024318477.pdf
    • https://cdn.shopify.com/s/files/1/0435/3615/4773/files/gastroenteritis_akut_dewasa.pdf
    • https://cdn.shopify.com/s/files/1/0437/7952/2717/files/geometric_probability_distribution_examples.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_off00005034.bin
5b97a9554128a752fa1f38615f980e67d709b647dca135c95188b072a6b47ecc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5034 4660 bytes
font_01_sfnt_off0000602a.bin
e26193426366fa2f7a1880770baf06504d2e5a0094115d0984509db6281e8bbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x602A 11824 bytes
font_02_sfnt_off000085d1.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85D1 4324 bytes

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