Malicious PDF — malware analysis report

Static analysis result for SHA-256 6eb0e5c52df304ad…

MALICIOUS

PDF

43.6 KB Created: 2020-08-22 14:22:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 481ce5aa434ba79c7328ac83c70c68a7 SHA-1: 4088eca33625c9c1293d2ae56c389e21a8369f9f SHA-256: 6eb0e5c52df304ad4fab8e329c4b04006792390d5b84a2c9e95210062d41f236
154 Risk Score

Malware Insights

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

The PDF contains embedded links that lead to a known malicious redirector, suggesting an attempt to lead the user to malicious content. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL https://ttraff.cc/pify?keyword=hypothyroidism+diet+pdf, which is a primary indicator of this attack.

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=hypothyroidism+diet+pdf
    • http://files.silverdalevillagemarket.co.nz/uploads/1/3/2/7/132712000/7cc374781187d6f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/2853/7753/files/4381442126.pdf
    • https://cdn.shopify.com/s/files/1/0438/5089/1424/files/giwizi.pdf
    • https://cdn.shopify.com/s/files/1/0448/0489/8978/files/classics_of_analytic_philosophy_ammerman.pdf
    • https://cdn.shopify.com/s/files/1/0434/1615/8359/files/ratowureme.pdf
    • https://cdn.shopify.com/s/files/1/0429/1677/4054/files/77677208666.pdf
    • https://cdn.shopify.com/s/files/1/0435/4048/0164/files/40891120879.pdf
    • https://cdn.shopify.com/s/files/1/0431/7668/9825/files/57478157378.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57727452667.pdf
    • https://cdn.shopify.com/s/files/1/0434/5082/6919/files/tixabonubovobosi.pdf
    • https://cdn.shopify.com/s/files/1/0432/1899/3307/files/94992970071.pdf
    • https://cdn.shopify.com/s/files/1/0434/6704/7077/files/memetamogopani.pdf
    • https://cdn.shopify.com/s/files/1/0435/3399/2085/files/5970242413.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fed.bin
3b71d39007263c6ef32cfcc5cbfadeec448eee46f668bfd3a72d7613dee30a13
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FED 4784 bytes
font_01_sfnt_off00007036.bin
b58cca80af04a2cd2703dab762aadfd383b39956f008d46e3e127e11935877e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x7036 10308 bytes
font_02_sfnt_off00009386.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x9386 4324 bytes