Malicious PDF — malware analysis report

Static analysis result for SHA-256 f18ddf03b59de075…

MALICIOUS

PDF

43.6 KB Created: 2020-08-17 00:04:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ffb0c337c0e740e8a47f75ed38d6741 SHA-1: 10b775442c87a68e39f8f1331f04cca6576265a6 SHA-256: f18ddf03b59de075ff367e0d4b8c9122914503fd88d5b3f95547bf73f411cfaf
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF contains a large number of embedded links, with one specifically identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL and appears to be part of a link farm strategy, likely to manipulate search engine results or distribute further 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.ru/pify?keyword=flounder+fishing+galveston+report
    • http://files.thevillagehivebakeryandlocalfoodscollective.com/uploads/1/3/1/6/131637881/146546.pdf
    • http://files.startatravelbusiness.com/uploads/1/3/1/4/131453543/ribopusub_jekefederam_bogofowadoku.pdf
    • http://files.jdalestudio.com/uploads/1/3/1/4/131406390/vuzofikedudakog-jezowoti-wexupazinunu-sagiga.pdf
    • http://nunatoje.bombdudecomics.com/uploads/1/3/0/8/130813747/gevaz.pdf
    • https://cdn.shopify.com/s/files/1/0437/2260/4695/files/catia_electrical_harness_design_training.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/9204741539.pdf
    • https://cdn.shopify.com/s/files/1/0438/1851/6637/files/active_and_passive_voice_formula_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/7022/5574/files/66565493117.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/87967576867.pdf
    • https://cdn.shopify.com/s/files/1/0428/0995/0367/files/70935481798.pdf
    • https://cdn.shopify.com/s/files/1/0429/3731/9590/files/35146450605.pdf
    • https://cdn.shopify.com/s/files/1/0433/5504/6037/files/87960262284.pdf
    • https://cdn.shopify.com/s/files/1/0437/7785/1550/files/sports_heads_soccer.pdf
    • https://cdn.shopify.com/s/files/1/0433/8289/8840/files/history_of_english_novel.pdf
    • https://cdn.shopify.com/s/files/1/0438/4446/8898/files/azure_information_protection.pdf
    • https://cdn.shopify.com/s/files/1/0435/9690/6659/files/eia_weekly_petroleum_status_report.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_off00006d3b.bin
5953309396c60f4d96f3f63fb628462390541caba1a4bc9c145290566379e2b6
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D3B 5320 bytes
font_01_sfnt_off00007f59.bin
e6be914e27cda5fefec3c2a8d7c0164289a53799440dc18b7a41eceabada2475
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F59 10060 bytes