Malicious PDF — malware analysis report

Static analysis result for SHA-256 6628bc34bc788d68…

MALICIOUS

PDF

47.7 KB Created: 2020-07-11 02:39:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1bb58d77842dd3762c4267fe4c5e02b9 SHA-1: 5bb8aa32ded79affe090b82e350c6e30bb3a4892 SHA-256: 6628bc34bc788d683d9b687e9701ce12f533d1b71363194d0baeb71b7d4fabff
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 domains associated with link farms and redirectors, indicating a phishing or malicious redirection attempt. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to direct users to malicious content, likely for credential harvesting or malware distribution.

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.com/pify?keyword=blended+learning+journal+pdf
    • http://files.restorativejusticepartners.org/uploads/1/3/1/0/131070979/kigugutemibug.pdf
    • http://files.hestercox.com/uploads/1/3/0/8/130874613/vejifusaxupipeworama.pdf
    • http://files.theyogaschoolny.com/uploads/1/3/0/7/130775942/668541.pdf
    • http://files.catheymccrary.com/uploads/1/3/1/8/131871480/472de31.pdf
    • http://files.ayefilmstudio.com/uploads/1/3/0/7/130740480/6273346.pdf
    • http://files.sealedremnant.com/uploads/1/3/1/4/131438682/bebavub.pdf
    • http://files.hburghda.com/uploads/1/3/2/8/132814476/5eeeb261.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://sotetusuveti.files.wordpress.com/2020/07/fofevikukobawix.pdf
    • https://pisurika.files.wordpress.com/2020/07/noduxanelonixiguxubuf.pdf
    • https://sujotupuro.files.wordpress.com/2020/06/lekafudogasinipamim.pdf
    • https://jerobure.files.wordpress.com/2020/06/kotawerevavinug.pdf
    • https://gamekupori.files.wordpress.com/2020/07/diguzupevigerise.pdf
    • https://faxotobajej.files.wordpress.com/2020/06/66236813884.pdf
    • https://cdn.shopify.com/s/files/1/0433/3728/5797/files/92141002077.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wexanenivoxepabulolud.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mowelikuzamutaj.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_off0000776b.bin
c1f8f0637c442d8cd188fb82d59a28cb34849b8ca7cd7390130d4bdb89f99602
pdf-font-stream PDF embedded font (sfnt) at offset 0x776B 4960 bytes
font_01_sfnt_off00008852.bin
04a401fac00d19b7fa1dba21cc45ee85602812ca2e2558a9d8c256590afb5895
pdf-font-stream PDF embedded font (sfnt) at offset 0x8852 12788 bytes