Malicious PDF — malware analysis report

Static analysis result for SHA-256 8137d181f9048c3d…

MALICIOUS

PDF

40.1 KB Created: 2020-08-16 23:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15c7abd2837971f65f3021cbe4c0e828 SHA-1: 7bf3d41fe30a0e1645b6d55cf37f45c77c87fe5d SHA-256: 8137d181f9048c3d4a146fe0da15ecc9827eabedb3c87178992a8603f02ba488
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many pointing to external PDF files, which is characteristic of a link farm. One of these URLs, 'https://ttraff.cc/pify?keyword=australian+drinking+water+guidelines+pdf', is identified as a malicious redirector. 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/pify?keyword=australian+drinking+water+guidelines+pdf
    • http://files.fritosport.com/uploads/1/3/0/7/130739986/rebazokig-rowuromuzawu.pdf
    • http://files.sevenhillsbakery.shop/uploads/1/3/0/8/130814308/buzopigisijipi.pdf
    • http://zizodelaf.melaninreigns.com/uploads/1/3/1/3/131384495/kamasosozasow.pdf
    • http://fugemu.teapup.com/uploads/1/3/1/6/131606457/mirazapelopimivaku.pdf
    • https://cdn.shopify.com/s/files/1/0446/7779/1897/files/blood_stains_sheets_bed_bugs.pdf
    • https://cdn.shopify.com/s/files/1/0438/2133/4688/files/49779874552.pdf
    • https://cdn.shopify.com/s/files/1/0434/3506/5505/files/lekemofomukur.pdf
    • https://cdn.shopify.com/s/files/1/0432/9324/5590/files/wibek.pdf
    • https://cdn.shopify.com/s/files/1/0434/7897/4629/files/kerbal_space_program_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/18396470220.pdf
    • https://cdn.shopify.com/s/files/1/0446/9391/3756/files/45923761188.pdf
    • https://cdn.shopify.com/s/files/1/0429/6219/0499/files/benztropine_davis_drug.pdf
    • https://cdn.shopify.com/s/files/1/0429/3401/0015/files/40982094672.pdf
    • https://cdn.shopify.com/s/files/1/0433/8358/6974/files/wisojifuw.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_off00005f13.bin
04dd1d6a5204e1a6b4ddbb5742cdc100738e6778a9309e099a83ec037ebb4dce
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F13 5356 bytes
font_01_sfnt_off0000716b.bin
0f4da0bc21bd2ec9b630663532d9f9380bfb67546320a96ac6230784e148549c
pdf-font-stream PDF embedded font (sfnt) at offset 0x716B 9968 bytes