Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bc520d7460c8e89…

MALICIOUS

PDF

49.7 KB Created: 2020-08-15 08:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 288ae9398632b1a143b1baaa01328815 SHA-1: 9af77bde1e1bc3666bf1e33b4484de6bb03398b6 SHA-256: 7bc520d7460c8e890418f6600c020febe832e0ff56d9f5ddea8ed19925d121d4
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL and several benign-looking URLs hosted on Shopify, likely to lend legitimacy. The primary attack vector appears to be luring the user to click the malicious link, leading to further compromise.

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/wb?keyword=hyphaene%20coriacea%20pdf
    • http://files.thelifelinechurch.org/uploads/1/3/0/7/130740069/8181346.pdf
    • https://cdn.shopify.com/s/files/1/0429/5242/5631/files/climate_smart_agriculture_in_ghana.pdf
    • https://cdn.shopify.com/s/files/1/0432/3491/8568/files/74823127627.pdf
    • https://cdn.shopify.com/s/files/1/0430/9821/0461/files/19308310049.pdf
    • https://cdn.shopify.com/s/files/1/0435/2360/4631/files/42008918619.pdf
    • https://cdn.shopify.com/s/files/1/0428/4894/4284/files/rujuxiwibenugibuju.pdf
    • https://cdn.shopify.com/s/files/1/0431/4267/6648/files/18667206359.pdf
    • https://cdn.shopify.com/s/files/1/0431/9982/4032/files/81092229052.pdf
    • https://cdn.shopify.com/s/files/1/0431/1737/9745/files/platform_bed_frame_full_white.pdf
    • https://cdn.shopify.com/s/files/1/0431/0846/6845/files/rijewadidimitaraxikuz.pdf
    • https://cdn.shopify.com/s/files/1/0436/3013/3406/files/kijemukevoniwamevizinoge.pdf
    • https://cdn.shopify.com/s/files/1/0440/2790/4165/files/budapest_airport_map.pdf
    • https://cdn.shopify.com/s/files/1/0435/2465/3224/files/venonivo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8973/1479/files/pugafijeb.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_off000077d1.bin
50fdb4e1d0d040e287396a6c0ff3a5e4d58a4e45d9ad712fd948df03ee136784
pdf-font-stream PDF embedded font (sfnt) at offset 0x77D1 4804 bytes
font_01_sfnt_off00008809.bin
5eb169bb751813c4a2e0d5487034d929747146fabde6edf0c23f62089992964b
pdf-font-stream PDF embedded font (sfnt) at offset 0x8809 10552 bytes
font_02_sfnt_off0000ac08.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0xAC08 4324 bytes