Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad09de3ee7645c85…

MALICIOUS

PDF

47.3 KB Created: 2020-10-05 08:21:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: b1078211fbdc19a5653625f7eac39417 SHA-1: 7b89a649c9a48e1c94d319e82374643e8213bea8 SHA-256: ad09de3ee7645c850a91f3d2b0f113865290512401b383985c18d22d07ceaf2f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that lead to a malicious redirector and a large number of external links, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, contains text related to 'self care activities' and a URL that aligns with the malicious redirector heuristic. The ML classifier also strongly indicated maliciousness.

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.link/pify?keyword=the+big+list+of+self+care+activities In PDF document text
    • https://site-1037145.mozfiles.com/files/1037145/77717350359.pdfIn PDF document text
    • https://site-1040002.mozfiles.com/files/1040002/56992233553.pdfIn PDF document text
    • https://site-1043119.mozfiles.com/files/1043119/30756460070.pdfIn PDF document text
    • https://site-1040998.mozfiles.com/files/1040998/65703057830.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/96cf2625-ed31-4194-81d0-bedfc57489b8/78990041162.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df985229-201d-4ed7-9831-a16a5bfbc805/60268112587.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d475020e-f63f-42bd-acb5-04f200928568/kixemuvawenokarapibapekat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7381fb67-6953-45a3-838e-f907c693ce97/zusadedisunase.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac2c2875-cda6-4911-bb67-307ee59bbcf1/34919963102.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/3304/5403/files/43999245289.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/4524/4058/files/53479376656.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/6249/5894/files/lord_of_the_flies_chapter_10_worksheet_answers.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65DF 4972 bytes
SHA-256: 5df0621d47cb0aa7e09b5154e13e08058feda5ba77c257d0887ab0bcd0ef1f51
font_01_sfnt_off000076e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76E9 14004 bytes
SHA-256: e28f3c97105c7b2334081ababf5af0f399d67dd22da7ae5a334203978464fae7
font_02_sfnt_off0000a276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA276 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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