Malicious PDF — malware analysis report

Static analysis result for SHA-256 3811bb7f58623d3c…

MALICIOUS

PDF

37.1 KB Created: 2020-10-12 02:41:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 81b64197e3192b42fd3a0bb9a497c298 SHA-1: 7e225c27b798e84f477aebc33c20a815af3ec8c2 SHA-256: 3811bb7f58623d3c139cd389e87a78dfab79ba0ea3de367f8df08b0178eb7723
194 Risk Score

Malware Insights

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

The PDF document contains a lure related to a "uic blackboard issue" and embeds a large number of links. One critical heuristic identified a malicious redirector link, and another noted a link farm of generated PDFs. The ML classifier strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

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.club/pify?keyword=uic+blackboard+issue In PDF document text
    • http://fofaragim.youth4ti.org/uploads/1/3/1/4/131438418/panikesosukogozob.pdfIn PDF document text
    • http://files.whogivesascrapcolorado.com/uploads/1/3/0/7/130738861/nidekavokiliwe_koxilado.pdfIn PDF document text
    • http://files.danielleabrams.com/uploads/1/3/1/3/131379540/2578715.pdfIn PDF document text
    • http://vonabexep.ankyloglossiabodyworkers.com/uploads/1/3/1/4/131409546/devubimituwupamuxi.pdfIn PDF document text
    • http://files.claudiasclassroom.com/uploads/1/3/0/8/130813650/mezimerisiv_wanok_suworimeken.pdfIn PDF document text
    • http://files.littlebitofheavenadoptionreferral.com/uploads/1/3/0/8/130814190/vivufawowodusedep.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a50e5fa2-512c-452a-8345-0ab50d0dbd19/66577604603.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98e3cb50-fdbd-4df2-bd58-62a90ed27b4a/60299338636.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5755346c-804f-4e47-8990-80c04959951c/10496373869.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c177951-6443-48e4-b849-dfd8fc2c359f/punamosamuwemozaxeze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff9bf1a5-ee1e-4d9a-976b-109476cf7c63/walolisuduwetebenev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df074756-94af-4ca0-af6e-ff5435f92abf/kefupepodiwugeti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/125d834c-1b75-4a00-9a2e-c4ea870bc137/69502196035.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/454166e3-a0c2-459a-a4f6-75051834c966/tuninetafasojazepupad.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_off0000535a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x535A 5128 bytes
SHA-256: c1317965ceaefd75346730caca5f02b3339fb2a2e8bd30d686ced0d1b975bf84
font_01_sfnt_off000064ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64CA 10236 bytes
SHA-256: fbc50da30334edd1c1b58a288443e216aa0766315db6184927b73436cf708c99

Open this report in the interactive analyzer, or submit your own file for analysis.