Malicious PDF — malware analysis report

Static analysis result for SHA-256 77a443026702c173…

MALICIOUS

PDF

38.4 KB Created: 2020-08-18 16:25:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38c56419e2a4a984205f39f3863d8faa SHA-1: 87eefdc7f21a1adb7e71f1ffe7298ba6617a4761 SHA-256: 77a443026702c173d0943f614a9fc47f30182edfec91ce32047c3dcb49934daf
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://ttraff.cc/pify?keyword=bloody+roar+game+for+android+free'. It also exhibits a PDF link farm heuristic, suggesting it's part of a larger SEO manipulation scheme to distribute files. The presence of a visual download button lure further supports a deceptive user interaction pattern. While no scripts were directly extracted, the overall structure and linked URLs indicate an attempt to redirect users to malicious content, likely for further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=bloody+roar+game+for+android+free
    • http://files.bayareabiofeedback.net/uploads/1/3/1/3/131380339/segif.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/damegadunuje.pdf
    • https://cdn.shopify.com/s/files/1/0432/7302/7749/files/25323110792.pdf
    • https://cdn.shopify.com/s/files/1/0427/9946/4611/files/non_parametrik_testler.pdf
    • https://cdn.shopify.com/s/files/1/0429/6559/8364/files/nigog.pdf
    • https://cdn.shopify.com/s/files/1/0433/1202/1662/files/89739768755.pdf
    • https://cdn.shopify.com/s/files/1/0440/5588/8022/files/lizowunalaxu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9535/9641/files/astm_a105_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/0978/4482/files/77709704025.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_off000058e2.bin
9fd6fd5ddb232effb9b8a31ceed59c3645adc62e2154f89c521fd11c34fa1ed2
pdf-font-stream PDF embedded font (sfnt) at offset 0x58E2 5200 bytes
font_01_sfnt_off00006a86.bin
437ee6f2a028441de09efd285f724daec5ffc2415a0d176453a95f4b0d9f233f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A86 10128 bytes