Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ae9e7ad76a556a8…

MALICIOUS

PDF

44.3 KB Created: 2020-10-25 17:39:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec97c00e8fb5569b999dca0b7748b947 SHA-1: 182d1f29453a7de33bee516f41b7eecba1d21275 SHA-256: 4ae9e7ad76a556a811ca817a65f8b96f114adc2fa761eaceafcbe4d69ef81905
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to suspicious domains and appear to be part of a link farm designed to manipulate search engine results. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a link to traff.ru as a known malicious redirector. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the primary attack vector appears to be directing users to malicious external sites.

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/123?keyword=razor+dota+2+guide+2020
    • https://zadumeredevasax.weebly.com/uploads/1/3/1/4/131453870/wesuzivuzukupiripat.pdf
    • https://xazojitov.weebly.com/uploads/1/3/1/4/131408465/kanunevam-rufiwenaviru.pdf
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/kadijamiruvinugeno.pdf
    • https://sopodepewujo.weebly.com/uploads/1/3/4/3/134340903/1665219.pdf
    • https://vilukenuxe.weebly.com/uploads/1/3/2/8/132814007/pugimus.pdf
    • https://misikeni.weebly.com/uploads/1/3/4/3/134336029/favijojobuzaje.pdf
    • https://femitinekabel.weebly.com/uploads/1/3/1/4/131437683/ketijalugaso_penexat.pdf
    • https://dokakida.weebly.com/uploads/1/3/1/3/131380589/wolotanezogo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0468/0112/5525/files/2020_questions_about_me_free.pdf
    • https://cdn.shopify.com/s/files/1/0266/7580/6391/files/under_the_perpetual_inventory_system_when_a_seller_grants_a_sales_allowance.pdf
    • https://s3.amazonaws.com/felasorarabipis/sultans_of_swing_piano_sheet_music.pdf
    • https://s3.amazonaws.com/zinudipir/hp_smart_app_scan_to.pdf
    • https://s3.amazonaws.com/subud/zetigujiku.pdf
    • https://s3.amazonaws.com/bewibiwat/acid_bases_and_salts_class_10_ncert_solutions.pdf
    • https://s3.amazonaws.com/jubiferekaka/docs_to_converter_apk.pdf
    • https://s3.amazonaws.com/kavalukato/89850832570.pdf
    • https://s3.amazonaws.com/felasorarabipis/48223725201.pdf
    • https://s3.amazonaws.com/leguvefu/forward_caste_list_in_tamilnadu.pdf
    • https://cdn.shopify.com/s/files/1/0501/8697/7441/files/fotobebokizuzotamapedewet.pdf
    • https://cdn.shopify.com/s/files/1/0481/8052/7258/files/gavufebepigexumuxutefupim.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_off00006ef0.bin
a52d2c19ca73630834b5f9437a093d40041f3322560c8fe17d1a4d7b18267a49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EF0 5112 bytes
font_01_sfnt_off0000806d.bin
a24ec780c5eb9e565baf4c1867d634fcb75349ae997ff1f79c72e840ecb097cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x806D 10396 bytes

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