Malicious PDF — malware analysis report

Static analysis result for SHA-256 715c24237edd27d5…

MALICIOUS

PDF

42.3 KB Created: 2020-08-22 12:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3981a48395b3054a21ca6ab1a90272b0 SHA-1: f23a9fd6e5e411ecfbceaea94db2a8a07b5806a7 SHA-256: 715c24237edd27d5562512486f7d77c4accbe8ae3b5e52885ce867db85ba5c4a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service known to host malicious content. The document body, though heavily obfuscated, contains a URL that also leads to this redirector. This suggests a phishing or scam attempt to direct users to malicious sites.

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=biology+textbook+for+secondary+school
    • http://files.advancead.com/uploads/1/3/0/7/130775949/d7fb5b240ba12.pdf
    • http://dalam.muphipvsouthbay.org/uploads/1/3/0/7/130776088/zejafupedukexewaf.pdf
    • http://files.soulsweetproductions.com/uploads/1/3/1/6/131636737/f6387a5f7fc5a6.pdf
    • http://files.militarypsych.org/uploads/1/3/1/3/131384025/pudaguzapu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0444/5346/2183/files/sample_balance_sheet_and_income_statement_of_a_company.pdf
    • https://cdn.shopify.com/s/files/1/0437/2119/5688/files/autodesk_sketchbook_apk_hack_version.pdf
    • https://cdn.shopify.com/s/files/1/0430/7881/1810/files/how_to_refresh_jquery_autocomplete.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/afcat_result_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/5982/2243/files/sabixadizun.pdf
    • https://cdn.shopify.com/s/files/1/0454/7071/1958/files/suzomelezafoduwume.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wopesutokuvikoku.pdf
    • https://cdn.shopify.com/s/files/1/0438/9643/8936/files/76866625015.pdf
    • https://cdn.shopify.com/s/files/1/0431/3792/5281/files/discovering_the_humanities_3rd_edition_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/3618/0634/files/56383136975.pdf
    • https://cdn.shopify.com/s/files/1/0448/6466/7810/files/aachen_city_map.pdf
    • https://cdn.shopify.com/s/files/1/0432/5684/0350/files/buxelopezexojifax.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064ae.bin
08e17bbdf8bbd2954c99c2972626c574e14b3bcc967006691954ae484462d10a
pdf-font-stream PDF embedded font (sfnt) at offset 0x64AE 5704 bytes
font_01_sfnt_off0000781e.bin
e7ed221fe43c17417d3afda066a51b9545a8b64084ee6ec9c0d8d793ee59aa61
pdf-font-stream PDF embedded font (sfnt) at offset 0x781E 10896 bytes