Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b8d8b3a80dceb92…

MALICIOUS

PDF

40.8 KB Created: 2020-08-14 07:26:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 83874f41c2d3bd0482f2b59a4d40d310 SHA-1: 77b2b6eb4e1d05cf041206f95131ff9e3862ccac SHA-256: 6b8d8b3a80dceb92e10ee4835cd29769a6d603746afeafecbe115760493505bb
194 Risk Score

Malware Insights

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

The PDF contains numerous links, including one to a known malicious redirector infrastructure (ttraff.cc) and others that appear to be part of a link farm. The document body, though heavily obfuscated, contains text related to 'application for new zealand citizenship form' and a URL that likely serves as a lure. The ML classifier strongly indicates maliciousness, and the presence of multiple PDF link farm heuristics points to a campaign distributing malicious content.

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.cc/pify?keyword=application+for+new+zealand+citizenship+form
    • http://wuxejadi.northeastsocietyforvascularnursing.com/uploads/1/3/0/7/130775045/dasugiw.pdf
    • http://files.ckcarchitect.com/uploads/1/3/0/9/130969166/ca8932fe7958.pdf
    • http://files.lhstv.net/uploads/1/3/1/4/131437363/c9e77c2.pdf
    • http://files.da1only1.com/uploads/1/3/1/8/131857494/kiwosuvunetigew_xenazakuwi_pepune.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xidegafizupewutuzu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2412/9952/files/pegebawoma.pdf
    • https://cdn.shopify.com/s/files/1/0432/8351/3499/files/xuwakutunakokizokapoda.pdf
    • https://cdn.shopify.com/s/files/1/0435/1059/5748/files/sizedire.pdf
    • https://cdn.shopify.com/s/files/1/0438/4430/5061/files/sapawonira.pdf
    • https://cdn.shopify.com/s/files/1/0428/8898/6787/files/active_listening_games.pdf
    • https://cdn.shopify.com/s/files/1/0429/7709/9935/files/base64_image_to_java.pdf
    • https://cdn.shopify.com/s/files/1/0431/8189/9936/files/22133199459.pdf
    • https://cdn.shopify.com/s/files/1/0451/1835/7669/files/algebra_definition_and_examples.pdf
    • https://cdn.shopify.com/s/files/1/0438/3460/5730/files/osrs_merlin_s_crystal_quick_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/5185/9616/files/78298224442.pdf
    • https://cdn.shopify.com/s/files/1/0435/2920/7957/files/free_to_word_converter_download_online.pdf
    • https://cdn.shopify.com/s/files/1/0428/5503/9135/files/82668350483.pdf
    • https://cdn.shopify.com/s/files/1/0437/3879/2085/files/zazomekizurum.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_off00005fe9.bin
d4ea5127127120272a2d10ff6fb4a62a69e731b11985f1a679475347015576bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FE9 5528 bytes
font_01_sfnt_off00007298.bin
eb5577736ee1b066c7fedfdf7725d895175e29cf861ed9cd94fa915ad0114c6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7298 10344 bytes

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