Malicious PDF — malware analysis report

Static analysis result for SHA-256 707723204f23302e…

MALICIOUS

PDF

43.6 KB Created: 2020-08-24 17:11:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3870cc11569577019725f2255c33a3f4 SHA-1: d3b444020948180a159f3b164bbc86b4fdfd3315 SHA-256: 707723204f23302ebc151cbaef08ffca3fe0e829b3bfc724fb922766234f56d3
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous links, many of which point to a link farm designed to distribute malicious content. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'https://ttraff.cc/pify?keyword=free+word+document+letterhead+templates', which likely serves as a gateway to further malicious payloads. The document's content and structure suggest a lure to entice users to click these links, potentially leading to exploitation or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=free+word+document+letterhead+templates
    • http://nopirapo.artfulcatholic.net/uploads/1/3/2/8/132814194/3896073.pdf
    • http://ziwopexi.westmeadhospitalwhistleblowers.com/uploads/1/3/0/8/130813669/f5b2b9070b.pdf
    • http://sajokij.safespaceamerica.org/uploads/1/3/2/6/132681352/turowepisosib_ginala_ginowopo_wiwip.pdf
    • http://files.klahyatt.com/uploads/1/3/2/7/132712034/30ce12eb75349.pdf
    • http://gajopuz.rohrbachsfarm.net/uploads/1/3/1/0/131070374/dowimula.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/kiwolarusir.pdf
    • https://cdn.shopify.com/s/files/1/0431/2861/9168/files/bulojosovave.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/welilavuruwad.pdf
    • https://cdn.shopify.com/s/files/1/0432/0958/8897/files/taladro_bosch_gsb_550_re_manual.pdf
    • https://cdn.shopify.com/s/files/1/0439/4778/6398/files/aptitude_test_for_class_9.pdf
    • https://cdn.shopify.com/s/files/1/0430/1671/6437/files/isometric_view_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0437/6988/8920/files/clownfish_care_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0429/7365/9290/files/tejafowaxirugu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2206/5557/files/jelovitajepabil.pdf
    • https://cdn.shopify.com/s/files/1/0435/6040/3103/files/gobalu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2436/7262/files/xubabadumuwifuxubu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2468/7014/files/salvation_army_valuation_guide.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_off00006dcc.bin
c10a2827430031d08aa20c8bd3e7a315fa9014f57cbc857eb05af84905a4efbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DCC 5360 bytes
font_01_sfnt_off00007fe4.bin
806a35cba2b3c4d75a803182d07457ae13db0decec4b8683932dfb80889c2721		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FE4 9820 bytes

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