Malicious PDF — malware analysis report

Static analysis result for SHA-256 65de48b1ec975bdf…

MALICIOUS

PDF

64.2 KB Created: 2020-08-09 02:30:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b62a4cab252ac27bd647c300501c1e0 SHA-1: a454c44cfeb2bb52a79e59a8c5e54e80162b84a5 SHA-256: 65de48b1ec975bdfbe8527e481c19fe4fdd97c71ab12875555b47cafdc5ae63c
194 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 redirector services or algorithmically generated URLs, indicating a link farm or phishing attempt. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags the URL 'https://ttraff.ru/pify?keyword=berlin+conference+summary+pdf' as malicious infrastructure. The ML classifier also strongly indicated maliciousness. 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 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.ru/pify?keyword=berlin+conference+summary+pdf
    • http://files.wildlifeworldwidephotographycompetition.com/uploads/1/3/2/7/132740343/nemumovekiso-rifoxavugas-dijewo-xapizivej.pdf
    • http://files.flipsidetoo.com/uploads/1/3/0/7/130776499/dixumuti_rinoma_woxilufu_fetulugi.pdf
    • http://files.circle5feeds.com/uploads/1/3/1/1/131164472/9595537.pdf
    • http://files.kathrynconeway.com/uploads/1/3/2/7/132740756/sipiwofapasamuxa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/6118/2617/files/lirirepidezere.pdf
    • https://cdn.shopify.com/s/files/1/0437/2316/1768/files/levedu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3631/9639/files/star_interview_preparation.pdf
    • https://cdn.shopify.com/s/files/1/0438/4971/1781/files/auma_multi_turn_actuators.pdf
    • https://cdn.shopify.com/s/files/1/0431/8108/0738/files/54574036008.pdf
    • https://cdn.shopify.com/s/files/1/0432/5077/8269/files/pulse_oximetry_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0430/5892/1621/files/73073287075.pdf
    • https://cdn.shopify.com/s/files/1/0435/3464/7460/files/5154788900.pdf
    • https://cdn.shopify.com/s/files/1/0441/3505/5512/files/gutopivoturanurekovu.pdf
    • https://cdn.shopify.com/s/files/1/0447/1144/4634/files/behavioural_science_theory.pdf
    • https://cdn.shopify.com/s/files/1/0431/7931/1253/files/amar_ujala_epaper_agra_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/4136/4890/files/65816017966.pdf
    • https://cdn.shopify.com/s/files/1/0434/5580/7640/files/tizomusovader.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_off0000bd67.bin
6f5b28e466e6268bb617f147c53cf8f6a96ceeb837cd3a88f7e1eda22eeaf641		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD67 5452 bytes
font_01_sfnt_off0000cfe7.bin
97aaa7181453b1e0705c86f520ce8e29abaa01c1d6241143078a5e6d6d7260d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE7 10408 bytes

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