Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c737fa285bc577c…

MALICIOUS

PDF

54.1 KB Created: 2020-08-11 07:16:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be1551741747c1f3b92a899ba4638f86 SHA-1: 3c449ac4f5c3883f2ff1aa2a2ec12cca2877bab3 SHA-256: 5c737fa285bc577cc6abbc38a0ca65050a16ca22d40ac9e80ad664cb19d1655c
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector, ttraff.com. The document body, though heavily obfuscated, contains a reference to the same URL, suggesting an attempt to disguise malicious activity. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be a spearphishing attachment leading to a malicious redirector.

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=angina+de+pecho+fisiopatologia+pdf
    • http://files.christianbuildingmaterials.com/uploads/1/3/0/7/130738928/e471c43cb7.pdf
    • http://durereru.infusionbaroque.com/uploads/1/3/2/8/132814930/9840819.pdf
    • http://fumivire.sparklove.info/uploads/1/3/1/1/131164250/jarewikopapovesasi.pdf
    • http://files.zbsbatmitzvah.com/uploads/1/3/0/8/130873783/jipijomak.pdf
    • http://files.bfterrycheer.com/uploads/1/3/0/8/130814644/009b9e6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9480/2581/files/42665899918.pdf
    • https://cdn.shopify.com/s/files/1/0430/8123/6634/files/53843856560.pdf
    • https://cdn.shopify.com/s/files/1/0432/4127/5547/files/bautabellen_fr_ingenieure_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/1239/9010/files/18423316773.pdf
    • https://cdn.shopify.com/s/files/1/0433/0923/6374/files/doravomopi.pdf
    • https://cdn.shopify.com/s/files/1/0440/6480/0918/files/adding_and_subtracting_decimals_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0428/0696/8483/files/fajizopukaw.pdf
    • https://cdn.shopify.com/s/files/1/0431/8937/1029/files/bilelematewatafodaxe.pdf
    • https://cdn.shopify.com/s/files/1/0432/9105/0137/files/99952512078.pdf
    • https://cdn.shopify.com/s/files/1/0433/6576/1176/files/52749678407.pdf
    • https://cdn.shopify.com/s/files/1/0433/5393/1944/files/repetytorium_angielski_sownictwo.pdf
    • https://cdn.shopify.com/s/files/1/0435/4165/9797/files/aiag_cqi_27.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • https://medlineplus.gov/spanish/angina.html
    • 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_off00008b5d.bin
40458335a78293b9bc72c966c5c90d4c7490a713e6d81e6d8869a99cd457dd0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B5D 5308 bytes
font_01_sfnt_off00009d6a.bin
ad2a4180a98747abb1462cbc4a19b00e7689f929ad3c87b19b32da5790c6df2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D6A 14588 bytes

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