Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd31870de375a3e7…

MALICIOUS

PDF

42.2 KB Created: 2020-08-10 17:29:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3088826cb4c043b7a138ec55003968e SHA-1: 86f5d125ceb68c429ab1a764a04127c94bdd6af0 SHA-256: cd31870de375a3e73be4404756556ced814c02b7b4caf1ec502aa08422156b47
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to benign Shopify domains, but one critical link directs to a known malicious redirector at 'ttraff.com'. The document body, though heavily obfuscated, contains text related to 'Algebra 1 regents january 2020 answers pdf', suggesting a lure to trick users into clicking the malicious link. The ML classifier also 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=algebra+1+regents+january+2020+answers+pdf
    • http://files.ipsproptech.com/uploads/1/3/1/4/131407194/niketokeku_famojozaduwilul_gokoro.pdf
    • http://files.zodiacciphers.com/uploads/1/3/1/6/131637271/zerivexoxanitir_bojojor.pdf
    • http://files.katie-berger.com/uploads/1/3/2/7/132740633/rajim.pdf
    • http://files.emilyhector.com/uploads/1/3/0/7/130775876/00447b5cb73025.pdf
    • https://cdn.shopify.com/s/files/1/0430/4112/8601/files/cambridge_english_empower_a2_workbook_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0430/3686/8762/files/7.pdf
    • https://cdn.shopify.com/s/files/1/0431/0168/3873/files/badefaxalevaxonidepenoz.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2797/files/62042492950.pdf
    • https://cdn.shopify.com/s/files/1/0433/6582/6719/files/jariseteruvogolinot.pdf
    • https://cdn.shopify.com/s/files/1/0433/4957/3784/files/tumugeku.pdf
    • https://cdn.shopify.com/s/files/1/0430/6812/9431/files/xolukepunese.pdf
    • https://cdn.shopify.com/s/files/1/0434/0029/8648/files/61508018549.pdf
    • https://cdn.shopify.com/s/files/1/0432/9078/8000/files/bicep_tendinopathy_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0429/8991/2218/files/votenifuzodesepiralafu.pdf
    • https://cdn.shopify.com/s/files/1/0440/3258/9989/files/gubevatulukiranujetabo.pdf
    • https://cdn.shopify.com/s/files/1/0439/9765/9294/files/20910567848.pdf
    • https://cdn.shopify.com/s/files/1/0429/8234/2815/files/lidujanuw.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_off00006482.bin
02b4eb677489161258b39d4e5a026ba6f003445a51a1845c8f950d7d4288e3be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6482 5932 bytes
font_01_sfnt_off000078e1.bin
b204e8ecea273adb4cf223351e0e27b567e5ecfc5330630db573e01890fdc613		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78E1 10204 bytes

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