Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dbfc01a78ee1898…

MALICIOUS

PDF

40.3 KB Created: 2020-08-22 13:14:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8a8bbfe4f5141b1f54b71d1aeea1231 SHA-1: 8cb8660f294712905f9513c72448cbf5d74b1def SHA-256: 6dbfc01a78ee18989f31f40a94504db08f85f6cf34fc3a1cecc1a1c164097a02
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=letter+of+intent+form+template', suggesting a lure to a phishing or scam page. The presence of numerous external PDF links also indicates a link farm, a common tactic for SEO manipulation or distributing malicious content.

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=letter+of+intent+form+template
    • http://koneforur.stjohnlutheranchurchjenison.org/uploads/1/3/0/8/130874655/diduvopumawi.pdf
    • http://files.muralsbymckell.com/uploads/1/3/1/4/131406140/1249128.pdf
    • http://files.courtneyrivas.com/uploads/1/3/0/7/130775856/3876461.pdf
    • http://files.stressfreeteach.com/uploads/1/3/0/9/130969775/7006602.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2917/6232/files/47002045866.pdf
    • https://cdn.shopify.com/s/files/1/0429/8866/7034/files/35941924848.pdf
    • https://cdn.shopify.com/s/files/1/0428/4756/8039/files/reviw.pdf
    • https://cdn.shopify.com/s/files/1/0462/6654/8373/files/43776997362.pdf
    • https://cdn.shopify.com/s/files/1/0430/7596/0985/files/zaxufejazenege.pdf
    • https://cdn.shopify.com/s/files/1/0428/7404/4579/files/removing_crayon_from_clothing.pdf
    • https://cdn.shopify.com/s/files/1/0430/2392/5402/files/catastrophizing_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0435/5060/5461/files/canon_eos_600d_manual_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/5196/5855/files/wesujowakivosozagavinun.pdf
    • https://cdn.shopify.com/s/files/1/0432/0952/3355/files/58614711295.pdf
    • https://cdn.shopify.com/s/files/1/0433/9862/7495/files/sosibemusuzipijotuk.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_off000060a9.bin
08e6fafba1b0b5cb813eabbd51e4014abf2304f41d68a03103f9d37d4f072c31
pdf-font-stream PDF embedded font (sfnt) at offset 0x60A9 4812 bytes
font_01_sfnt_off000070ed.bin
ac19ae58b515bc91f0eb172cda99405d7818e24e00c5f981d6ed8bbe6ddf74f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x70ED 10468 bytes