Malicious PDF — malware analysis report

Static analysis result for SHA-256 10c315f17a4d2cc8…

MALICIOUS

PDF

56.6 KB Created: 2020-10-05 02:58:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 869467cf7485891008f0204edf6da296 SHA-1: b7a217729c1d880411f7e48e9fe818d2ced48794 SHA-256: 10c315f17a4d2cc8cec80d61e2142bb0365ccc6d44ae0208245813262513b741
224 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. One critical heuristic identified a link to a known malicious redirector at https://ggtraff.ru/pify. The document body, though heavily obfuscated, contains text related to 'Oracle pl/sql developer certified associate certification dumps', suggesting a lure to trick users into clicking the malicious links for fake certification materials. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ggtraff.ru/pify?keyword=oracle+pl%252Fsql+developer+certified+associate+certification+dumps In PDF document text
    • http://files.btccricket.co.uk/uploads/1/3/0/7/130775668/9533004.pdfIn PDF document text
    • http://sokefoso.internallyflawless.net/uploads/1/3/1/3/131381225/tivudu.pdfIn PDF document text
    • http://files.dmaastarkville.com/uploads/1/3/1/4/131452800/gamafexetajabijimu.pdfIn PDF document text
    • http://files.bizraeli-anglo.com/uploads/1/3/2/7/132740580/1364071ac8cd93.pdfIn PDF document text
    • http://files.hazelthomsonart.com/uploads/1/3/1/3/131398432/kenixon.pdfIn PDF document text
    • http://rozezes.swinhopelabradorsandgermanshepherds.com/uploads/1/3/2/7/132740813/9600933.pdfIn PDF document text
    • http://files.justmyblogtalk.com/uploads/1/3/1/6/131606343/buvusewafi.pdfIn PDF document text
    • http://files.globalbookrights.com/uploads/1/3/0/7/130776795/a3e0744f8.pdfIn PDF document text
    • https://site-1036659.mozfiles.com/files/1036659/lutarepuwelu.pdfIn PDF document text
    • https://site-1039829.mozfiles.com/files/1039829/fivenirag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1031/6694/files/24236821809.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2480/0168/files/how_to_make_armor_stand_in_minecraft_xbox_one.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9727 5552 bytes
SHA-256: b2b7c0fb6f22b8cffca1325eebfb11f9564299ddf89fb4a41c9ad6e993906897
font_01_sfnt_off0000a9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA9FC 13472 bytes
SHA-256: 297878cb2c553ba0edd130cb222533ffddf89d13564c4869f70081a15cf2187e

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