Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6553a1a8dbc215a…

MALICIOUS

PDF

40.9 KB Created: 2020-08-07 17:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 100b5717f2c4bc7f4b4beb3a12624a04 SHA-1: e4f94981948a96693daec8f83567b9bd4db84d79 SHA-256: c6553a1a8dbc215ac4693f41429e7222fba7a2b5494bd28df6bcaf7527178b00
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to Shopify domains, but one critical link redirects to a known malicious domain (ttraff.com). The document body, though heavily obfuscated, contains text related to 'calendrier 2019 et 2020 vacances scolaires pdf' and the malicious URL. This suggests a lure to download further malicious content or redirect to a phishing page. The ML classifier strongly supports the malicious nature of this PDF.

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.com/wb?keyword=calendrier%202019%20et%202020%20vacances%20scolaires%20pdf
    • http://files.samenecogardens.com/uploads/1/3/0/8/130813778/rubirifob.pdf
    • http://files.fiberdbye.com/uploads/1/3/0/7/130738741/8257358.pdf
    • http://files.lightstarcreations.com/uploads/1/3/0/9/130969885/mogozada.pdf
    • https://cdn.shopify.com/s/files/1/0433/2231/0811/files/kupadosegaripowomixuwefe.pdf
    • https://cdn.shopify.com/s/files/1/0431/6856/3355/files/discord_chat_rules.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/81108552740.pdf
    • https://cdn.shopify.com/s/files/1/0428/6555/7670/files/non_broadcast_media.pdf
    • https://cdn.shopify.com/s/files/1/0431/8353/8331/files/gudasobokupuxefadune.pdf
    • https://cdn.shopify.com/s/files/1/0432/0329/7438/files/wotowev.pdf
    • https://cdn.shopify.com/s/files/1/0433/0360/0283/files/24373016569.pdf
    • https://cdn.shopify.com/s/files/1/0438/5302/1334/files/55277539571.pdf
    • https://cdn.shopify.com/s/files/1/0439/2904/3099/files/78230235059.pdf
    • https://cdn.shopify.com/s/files/1/0431/7102/0957/files/integrated_resistors_and_capacitors.pdf
    • https://cdn.shopify.com/s/files/1/0431/6512/2711/files/vididuxovuxoneg.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kubogofire.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005bd0.bin
6ec62ccaf0ee048ea0d1c686ad69caedf3894c41a5d0fb0d736a800456583531
pdf-font-stream PDF embedded font (sfnt) at offset 0x5BD0 5596 bytes
font_01_sfnt_off00006eea.bin
b5ca13031a99a2a3bf86f6b9148d7b534ca95456f725cb751d7ccfb145cc5d21
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EEA 11940 bytes