Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd24e0f38650ed8b…

MALICIOUS

PDF

36.9 KB Created: 2020-08-12 12:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d94864b2a67ed86650a961feca7a500f SHA-1: 5dac55a1ff82e423a5e360ffb112f3c04174cb17 SHA-256: cd24e0f38650ed8b0fea5940668c1462bbc1aec6ae14d9d85a5c01ef697a2b9c
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document was flagged as malicious by a machine learning classifier and contains a large number of embedded links, indicating a link farm designed to redirect users. One of the primary links points to a known malicious redirector infrastructure at 'https://ttraff.com/wb?keyword=sram%20rival%2022%20crankset%20manual'. The document body itself is heavily obfuscated and contains some of these URLs, suggesting the primary purpose is to lure users to external malicious sites.

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/wb?keyword=sram%20rival%2022%20crankset%20manual
    • http://files.inmathclass.com/uploads/1/3/0/7/130740589/jipuraregap-pisojajo-dukefutanofoguz-gamov.pdf
    • http://files.helloworldwerehere.com/uploads/1/3/1/4/131438474/mejefapitu-ligizuw.pdf
    • http://files.ianburtphotography.co.uk/uploads/1/3/1/3/131380063/jetaga_bowenumogidap_ziwamokovujoduf_nuvotese.pdf
    • https://cdn.shopify.com/s/files/1/0432/8374/2884/files/virilopaxeduvisozab.pdf
    • https://cdn.shopify.com/s/files/1/0434/1848/4885/files/6970353379.pdf
    • https://cdn.shopify.com/s/files/1/0431/6826/8456/files/93710281645.pdf
    • https://cdn.shopify.com/s/files/1/0429/8578/3447/files/39059345684.pdf
    • https://cdn.shopify.com/s/files/1/0451/4293/3657/files/nowilebevigusivirunuka.pdf
    • https://cdn.shopify.com/s/files/1/0431/4287/3249/files/84301139352.pdf
    • https://cdn.shopify.com/s/files/1/0438/4748/3552/files/angaraka_stotram_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0433/5144/1560/files/sogiperezezilezanaduk.pdf
    • https://cdn.shopify.com/s/files/1/0440/5759/1960/files/xarupog.pdf
    • https://cdn.shopify.com/s/files/1/0428/4783/0183/files/abnormal_pap_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0430/8303/8874/files/23524758897.pdf
    • https://cdn.shopify.com/s/files/1/0430/4227/5485/files/guparisodena.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000046af.bin
e653f8959bd8dc1dc4219b52bcd9d835b90a566df4b03faa95f450cbcefdb8d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x46AF 5076 bytes
font_01_sfnt_off000057c9.bin
16f74be844a879705b81ea5ca07d92dec15c8481627d4747fb385618062cd22e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57C9 9640 bytes
font_02_sfnt_off000078d6.bin
8405bb6ca9a6fb718a2e910e1cdde4d74ac2122cab0061dc5f772322db9c7ccd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78D6 4324 bytes

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