Malicious PDF — malware analysis report

Static analysis result for SHA-256 842af7e60f9d862c…

MALICIOUS

PDF

35.7 KB Created: 2020-10-08 20:01:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ed7d79fb1e1157597b4a66d442ca7834 SHA-1: e93e65770cb3c371082d189f885ec92bba4ea77a SHA-256: 842af7e60f9d862c72b8f8a8ce096f0c656db1409189076f45b903b6bbfac7b4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document is identified as malicious by a machine learning classifier and contains numerous embedded links, many of which point to potentially malicious redirector infrastructure. The document masquerades as an educational resource ('5th grade science pacing guide') to entice users to click on these links. The primary malicious IOC is the redirector URL.

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.me/pify?keyword=5th+grade+science+pacing+guide In PDF document text
    • https://site-1036993.mozfiles.com/files/1036993/ketinesolafezipu.pdfIn PDF document text
    • https://site-1036962.mozfiles.com/files/1036962/34746902786.pdfIn PDF document text
    • https://site-1043332.mozfiles.com/files/1043332/gekobozukox.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/1/0492/3008/6297/files/formato_carta_poder_mexico.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2674/1405/files/radudivivunakime.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5385/0528/files/cute_cat_face_svg.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/5770/7680/files/chicken_wing_dissection_answers_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1eac6875-81c3-4249-a386-3b6b6839a93d/womotebezozimigewije.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1e58242-775b-4a9d-9330-4cd6f957aa7b/kagura.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e571d217-65d6-4766-a963-6ad3467fb903/letujebibupigemekuge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e7eff87-dee4-4467-8d13-57847c2e2ec7/dawowosasixufurin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2967e63a-e5cc-4f78-8949-bbdd659be898/sojud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bcc367c-1967-4a68-a94e-86e31632bc7e/ropuwipijojanow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39ca486d-7b21-4b73-87ee-f851b5892c90/32072369455.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ce1fb4e-4499-4401-893f-49be5b0e0ac0/39690382398.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_off00004409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4409 5332 bytes
SHA-256: 0ae0364a69b421c06027410be0e85e10e364fc0c818f7bec7ef26e8f976e6a25
font_01_sfnt_off00005629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5629 13804 bytes
SHA-256: 7b5df224040998e213a9efba37ee9cef2093112dc585ef82a1010253797f1363

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