Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bf8429b7f3c4b0e…

MALICIOUS

PDF

37.3 KB Created: 2020-08-13 21:31:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0402fd5deb57cc0f82c3faf35a6af5a5 SHA-1: ff0cf571c821a35e09202bfca64358f6069e0ce6 SHA-256: 7bf8429b7f3c4b0e5cd97dfe1159aa7d409df4f415358451bce959f3360fe8d5
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link farm and a malicious redirector URL, suggesting a phishing or scam attempt. The document body, though partially corrupted, includes the title 'Exponents and logarithms worksheet honors precalculus' and the malicious URL, indicating a lure to a malicious site. The presence of numerous embedded links, many pointing to Shopify, further supports the link farm heuristic. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=exponents+and+logarithms+worksheet+honors+precalculus
    • http://files.zgatl.org/uploads/1/3/1/8/131857465/a8db9f09446.pdf
    • http://files.c3pojhmi.com/uploads/1/3/2/3/132302916/rukunimavevowab-kilawemalijitir-rupulatelonu.pdf
    • http://files.davidcmahlercomics.com/uploads/1/3/1/4/131454255/72cbdf1b447a5.pdf
    • http://files.futura-foundation.co.uk/uploads/1/3/2/6/132695575/toberasenasasiwu.pdf
    • https://cdn.shopify.com/s/files/1/0436/0290/3202/files/kejobufupil.pdf
    • https://cdn.shopify.com/s/files/1/0430/4669/9165/files/85975266787.pdf
    • https://cdn.shopify.com/s/files/1/0440/3747/2421/files/python_object_oriented_programming_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dogazuzotefoninu.pdf
    • https://cdn.shopify.com/s/files/1/0433/4272/5275/files/26125621574.pdf
    • https://cdn.shopify.com/s/files/1/0433/0110/9920/files/nekejazezavaruvinos.pdf
    • https://cdn.shopify.com/s/files/1/0429/0756/6239/files/destinos_fatales_andres_caicedo.pdf
    • https://cdn.shopify.com/s/files/1/0429/8860/1503/files/bollinger_bands_settings_for_scalping.pdf
    • https://cdn.shopify.com/s/files/1/0432/8341/5204/files/nafapesa.pdf
    • https://cdn.shopify.com/s/files/1/0435/5407/8871/files/making_love_out_of_nothing_at_all_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0431/8245/7000/files/1942989525.pdf
    • https://cdn.shopify.com/s/files/1/0427/5293/4044/files/item_id_minecraft_pe.pdf
    • https://cdn.shopify.com/s/files/1/0429/3551/7337/files/wisiwovukogelupobarawap.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_off00004fa1.bin
587ce101144323daecc6c1df9cfacde2fe2cd8146fee3af679113f04633980be
pdf-font-stream PDF embedded font (sfnt) at offset 0x4FA1 5668 bytes
font_01_sfnt_off000062d0.bin
b2ec34cd5f7d10f53f29c61e4d9335786dab9b5f1e0a10f6591a8a473de2e969
pdf-font-stream PDF embedded font (sfnt) at offset 0x62D0 10216 bytes