Malicious PDF — malware analysis report

Static analysis result for SHA-256 a38e7d4a7ea91948…

MALICIOUS

PDF

46.2 KB Created: 2020-08-02 06:06:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3782f27be54089c075075d167cca6631 SHA-1: 6bbcf2015ce14e5b24f6ef1e9d3086c17b7bad3a SHA-256: a38e7d4a7ea91948c67273d42e05295ee8f9d009f5f38f7b689fe048e85d4467
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=nighthawk+r7000+dd-+wrt'. This indicates the document's primary purpose is to lure the user to a potentially harmful external site. The presence of a large number of embedded links, many hosted on Shopify, further supports a link farm or SEO poisoning tactic to distribute malicious content. 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.cc/pify?keyword=nighthawk+r7000+dd-+wrt
    • http://files.bnsathletics.ca/uploads/1/3/1/3/131378899/fakukel.pdf
    • http://files.goyevillage.com/uploads/1/3/2/7/132712000/7943797.pdf
    • http://files.skatefiction.com/uploads/1/3/0/7/130775361/xoleda.pdf
    • http://files.thejackedhipster.com/uploads/1/3/2/7/132740930/riseb-pirakivizenuduf-jodokivirobuki-repirarobuwanak.pdf
    • https://cdn.shopify.com/s/files/1/0434/2385/8845/files/19740475890.pdf
    • https://cdn.shopify.com/s/files/1/0439/9199/0430/files/sapadokewife.pdf
    • https://cdn.shopify.com/s/files/1/0437/7490/2423/files/counter_strike_classic_offensive_reddit.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nefodegaxinavikiva.pdf
    • https://cdn.shopify.com/s/files/1/0427/9359/9132/files/49293359793.pdf
    • https://cdn.shopify.com/s/files/1/0431/4267/6636/files/dipiturikaralo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9823/4270/files/88620792826.pdf
    • https://cdn.shopify.com/s/files/1/0437/3128/8216/files/pafotavuxiwivufis.pdf
    • https://cdn.shopify.com/s/files/1/0431/0027/4845/files/selixe.pdf
    • https://cdn.shopify.com/s/files/1/0432/0083/9842/files/xifegarimusudilere.pdf
    • https://cdn.shopify.com/s/files/1/0433/1978/7688/files/45028995921.pdf
    • https://cdn.shopify.com/s/files/1/0432/5575/9011/files/20808941221.pdf
    • https://cdn.shopify.com/s/files/1/0432/2482/6014/files/94311336944.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b0b.bin
c2c2af743e24e085928c46a4a165999d3c3cfb6ec20facba10f04346bce879ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B0B 4708 bytes
font_01_sfnt_off00007b3b.bin
5b0e834e5b2acb49af60b20786e094a0a24cb9af559c96045df95d90f32042aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B3B 10024 bytes
font_02_sfnt_off00009d99.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D99 4324 bytes

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