Malicious PDF — malware analysis report

Static analysis result for SHA-256 890bf684303ac562…

MALICIOUS

PDF

57.8 KB Created: 2020-08-18 20:12:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4d88d17a583db7368bea040565ab3960 SHA-1: 778c05a80c6b3da8f4959c281b75432139c03dba SHA-256: 890bf684303ac5628325ced5d7fbadc8b6ebada155ce54e7093f360341fff6a9
194 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with heuristics indicating a link farm and a malicious redirector. One of the embedded URLs, 'https://ttraff.ru/pify?keyword=dance+video+song++sharechat', is identified as a malicious redirector. The presence of numerous external PDF links suggests an attempt to manipulate search engine results or distribute further malicious content. No scripts were extracted, but the overall structure and link behavior are indicative of a malicious document.

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=dance+video+song++sharechat
    • http://files.helbreathng.online/uploads/1/3/1/3/131397927/4b8872652b4.pdf
    • http://lowolovi.deficientautobiographicalmemory.com/uploads/1/3/2/6/132681513/fidotadisotuj_zuluzib.pdf
    • http://nuwela.tutorworlduk.com/uploads/1/3/2/6/132695306/pevakafi.pdf
    • http://files.drakosden.com/uploads/1/3/0/7/130739169/dodefur.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0437/1503/5290/files/where_to_find_skyrim._ini.pdf
    • https://cdn.shopify.com/s/files/1/0438/3421/2509/files/62316845617.pdf
    • https://cdn.shopify.com/s/files/1/0437/5206/3125/files/57163610591.pdf
    • https://cdn.shopify.com/s/files/1/0429/3532/0742/files/zokapimeziwalid.pdf
    • https://cdn.shopify.com/s/files/1/0433/4590/3781/files/davomuv.pdf
    • https://cdn.shopify.com/s/files/1/0433/4272/5275/files/godatoxi.pdf
    • https://cdn.shopify.com/s/files/1/0433/2588/2518/files/stardew_foraging_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/9224/5656/files/game_lodge_business_plan.pdf
    • https://cdn.shopify.com/s/files/1/0447/3988/7255/files/banting_green_and_orange_list.pdf
    • https://cdn.shopify.com/s/files/1/0433/2060/6885/files/81414751929.pdf
    • https://cdn.shopify.com/s/files/1/0433/0668/0484/files/probability_math_definition.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004603.bin
fa67c9f03e5ed3a33d8feaa5b7f0a86fdb597968dca46e2bf4dd2f8764e1d93f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4603 2972 bytes
font_01_sfnt_off00005080.bin
18e98ea71c6f6dafb949a443e4572a29173926464c466dd4aa760d4cdadc9e0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5080 5016 bytes
font_02_sfnt_off00006180.bin
0207a002b002d0571d4bdadcc8e33e3292b420bddcb7899aea7cb0c2bfcdebb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6180 13844 bytes
font_03_sfnt_off00008c1e.bin
e24d48701eef94c51cbaeb9b68723a504f290faf095a6e5b40fc4bfe589482ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C1E 9508 bytes
font_04_sfnt_off0000acae.bin
cb9eac1a494a6dcde7905d2b15d4f385a1798f7de456e05215c5635aa6f21093		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACAE 18860 bytes
font_05_sfnt_off0000c8f9.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F9 4324 bytes

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