Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b48ca3666e9e293…

MALICIOUS

PDF

55.4 KB Created: 2020-08-29 12:37:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2fb27fe8ff85b4ef18aad2ed8f6c4450 SHA-1: e5d1ed22ee72773802f6c05c4f8858127672f498 SHA-256: 2b48ca3666e9e293f49991b579fda2c89967b6a96b8f243173844f4e69771aa3
152 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier as malicious and contains a critical heuristic indicating it links to known malicious redirector infrastructure. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links, one of which is a malicious redirector. The document body, though heavily obfuscated, contains the malicious URL and several other Shopify-hosted PDF links, suggesting a lure to external content.

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.link/wix?keyword=aoe2+camel+archer
    • https://cdn.shopify.com/s/files/1/0438/9987/9576/files/ssw_dealer_supply.pdf
    • https://cdn.shopify.com/s/files/1/0428/1974/8006/files/42705865633.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/1741436775.pdf
    • https://cdn.shopify.com/s/files/1/0437/9777/4497/files/the_indigo_spell.pdf
    • https://cdn.shopify.com/s/files/1/0432/6883/3436/files/kesudiginibazegubafo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/14192803693.pdf
    • https://cdn.shopify.com/s/files/1/0430/8670/8890/files/zitafibubuzomebeno.pdf
    • https://cdn.shopify.com/s/files/1/0428/9930/8700/files/67138585586.pdf
    • https://cdn.shopify.com/s/files/1/0432/6028/0982/files/jevusumi.pdf
    • https://cdn.shopify.com/s/files/1/0431/9635/0624/files/fikojogi.pdf
    • https://cdn.shopify.com/s/files/1/0436/2688/9369/files/boy_scouts_personal_fitness_merit_badge_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/8717/5588/files/49261974439.pdf
    • https://cdn.shopify.com/s/files/1/0432/7496/1059/files/jazz_chord_arpeggios.pdf
    • https://cdn.shopify.com/s/files/1/0435/0086/3640/files/free_tracing_letters_and_numbers_for_preschoolers.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_off00009af8.bin
6396524dd97e4864605e745eceed2fe16b0cc5bcabe57fe38b83b7613c412676
pdf-font-stream PDF embedded font (sfnt) at offset 0x9AF8 4980 bytes
font_01_sfnt_off0000abb6.bin
d08fb441030e35ca2e742a08f7f07a3111bb6016fbf44813eb732b578b513849
pdf-font-stream PDF embedded font (sfnt) at offset 0xABB6 10960 bytes