Malicious PDF — malware analysis report

Static analysis result for SHA-256 68574a7e46a1a548…

MALICIOUS

PDF

53.0 KB Created: 2020-08-31 03:03:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0edddaac0804f1dbe80e98318ade8975 SHA-1: 9e6fa9fe61175b35bc822de3040a45ae3a2d0f9c SHA-256: 68574a7e46a1a548869678fe660d3c360cf77afc25c7b4d548826b023badbd75
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to benign Shopify domains, but one critical link directs to a known malicious redirector. The document body contains text that appears to be a lure, possibly related to search engine optimization or a content farm, which is consistent with redirector abuse. 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.cc/wix?keyword=aguila+dorada+bis+horarios+corrientes+formosa
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/2962/4982/files/78375964425.pdf
    • https://cdn.shopify.com/s/files/1/0429/7257/7946/files/pengertian_alkalimetri.pdf
    • https://cdn.shopify.com/s/files/1/0433/5576/6942/files/12337727802.pdf
    • https://cdn.shopify.com/s/files/1/0450/0642/2184/files/91854750341.pdf
    • https://static.usrfiles.com/ugd/93c935_37d725fbae074754b908706b051ce2d3.pdf
    • https://static.usrfiles.com/ugd/3dd68e_5201492919e7486c9e57a0b4ba8b160e.pdf
    • https://cdn.shopify.com/s/files/1/0447/9890/2438/files/tratamiento_psicologico_para_alcoholismo.pdf
    • https://cdn.shopify.com/s/files/1/0427/9602/3975/files/53219477670.pdf
    • https://cdn.shopify.com/s/files/1/0436/0772/0099/files/jamb_admission_letter_sample.pdf
    • https://cdn.shopify.com/s/files/1/0432/6719/5040/files/vigitimokikel.pdf
    • https://cdn.shopify.com/s/files/1/0449/2935/1835/files/bergey_s_manual_volume_3.pdf
    • https://cdn.shopify.com/s/files/1/0432/9917/6612/files/79156477892.pdf
    • https://cdn.shopify.com/s/files/1/0431/3802/3592/files/rinixivaxiritigologifobex.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_off000083dd.bin
13547286d60b82ceedc2ae2066aef50bce5e40a1d197d4dc29170349c34ca2da
pdf-font-stream PDF embedded font (sfnt) at offset 0x83DD 5564 bytes
font_01_sfnt_off00009691.bin
24004ebac12b626e1ff8c5d7024cbb3c54c2d41b8cf65e037ac3d9aae305ecbb
pdf-font-stream PDF embedded font (sfnt) at offset 0x9691 15616 bytes