Malicious PDF — malware analysis report

Static analysis result for SHA-256 6617d23af1b14413…

MALICIOUS

PDF

41.4 KB Created: 2020-08-08 12:23:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 192fdf254413a6dbe98dae9ea3e0688f SHA-1: cbcc317a1f6bef0bc6e35dda5a03f1347a46dc35 SHA-256: 6617d23af1b144132f11a1bedf5f3a61e4e4e56720233429ca153ad5ad9ecac4
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 at `https://ttraff.ru/pify?keyword=alkaline+and+acidic+food+chart.+pdf`. The document body, though obfuscated, also contains this URL, suggesting an attempt to lure users to malicious sites. The presence of a mass external PDF link farm further indicates a malicious intent to distribute content or malware through a network of linked documents.

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=alkaline+and+acidic+food+chart.+pdf
    • http://govizuna.barcelonasoccerhouston.com/uploads/1/3/0/7/130776644/wumaguzupalasapo.pdf
    • http://files.sarahgoetzskincare.com/uploads/1/3/1/1/131164273/5d1c8.pdf
    • http://files.buckinghamshirelandscapegardeners.com/uploads/1/3/2/7/132740204/70dfeb5a.pdf
    • http://files.sineadlucey.com/uploads/1/3/2/6/132695401/e3547d.pdf
    • http://topodu.moondewessences.com/uploads/1/3/1/6/131606289/disixakudowi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/8239/0435/files/what_is_a_cog.pdf
    • https://cdn.shopify.com/s/files/1/0430/1147/3571/files/nezabixototuzewufofijed.pdf
    • https://cdn.shopify.com/s/files/1/0433/2906/1032/files/agenda_2020_editable.pdf
    • https://cdn.shopify.com/s/files/1/0434/0993/2440/files/losupa.pdf
    • https://cdn.shopify.com/s/files/1/0432/6850/5764/files/31149925995.pdf
    • https://cdn.shopify.com/s/files/1/0430/6560/6301/files/adobe_reader_update_mac.pdf
    • https://cdn.shopify.com/s/files/1/0433/5586/5242/files/befikowezup.pdf
    • https://cdn.shopify.com/s/files/1/0437/5671/6186/files/2010_ford_escape_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/5066/3073/files/honeywell_digital_thermostat_manuals.pdf
    • https://cdn.shopify.com/s/files/1/0450/1933/2766/files/ariens_st824_owners_manual.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_off0000647f.bin
162aa9a4dec30f6ba53394f69069c286342c431434535fb59ed6e7d4296a2c29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x647F 5152 bytes
font_01_sfnt_off00007606.bin
f0915fa8610fb6f7cd24c8cfeaf469c10c37e0ae757365553bfbf38d9e272e90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7606 10192 bytes

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