Malicious PDF — malware analysis report

Static analysis result for SHA-256 1939b20bc1fd1381…

MALICIOUS

PDF

40.2 KB Created: 2020-08-07 04:29:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 976f902a04c9216707600dccbeffff4b SHA-1: 9cd44cf8f07633b48217f60a629dc6f46089d322 SHA-256: 1939b20bc1fd1381250035c08ac7363f862a6abebc491393654b17c282cfce9b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF contains a large number of embedded links, many pointing to external PDF files, which is characteristic of SEO link farm abuse. One of the primary links directs to a known malicious redirector, indicating a malicious intent to lead users to harmful content. The ML classifier also strongly flagged this PDF as malicious.

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.cc/pify?keyword=criteria+characteristics+of+a+good+research+problem+pdf
    • http://files.vitalpomona.com/uploads/1/3/1/4/131407274/pisidizafemudit_nijadipebipapan_tasijudewetef_muvokikegugule.pdf
    • http://files.jaylubordercollies.com/uploads/1/3/1/8/131871912/ruzomopukijirin_sositulovexefi_kedovujoduxun.pdf
    • http://files.churchbestpractices.org/uploads/1/3/1/3/131380666/xofisikawaxav.pdf
    • http://files.roanclay.com/uploads/1/3/0/7/130740097/873e71c4897.pdf
    • http://files.reusinbysusan.com/uploads/1/3/0/7/130775784/vejuwekikezuke.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/3507/4465/files/posaxoregapufabowasuxo.pdf
    • https://cdn.shopify.com/s/files/1/0427/4746/1788/files/24010846798.pdf
    • https://cdn.shopify.com/s/files/1/0428/7463/4403/files/34027255187.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/7082322425.pdf
    • https://cdn.shopify.com/s/files/1/0432/0342/8515/files/rutinas_calistenia_en_casa.pdf
    • https://cdn.shopify.com/s/files/1/0441/2679/7976/files/fx_buckley_menu.pdf
    • https://cdn.shopify.com/s/files/1/0435/7927/7467/files/katoruzotataxe.pdf
    • https://cdn.shopify.com/s/files/1/0431/6522/1028/files/20175446138.pdf
    • https://cdn.shopify.com/s/files/1/0432/7807/4022/files/blood_type_a_positive_diet_food_list.pdf
    • https://cdn.shopify.com/s/files/1/0438/3621/1357/files/sukogugunelogunifelodibu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4343/0305/files/kumojatopidugadiz.pdf
    • https://cdn.shopify.com/s/files/1/0434/2641/4749/files/32160577199.pdf
    • https://cdn.shopify.com/s/files/1/0434/5639/7474/files/waves_plugins_torrents.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_off00005f42.bin
d5ea6a8ca236310ed6af802c3b8819dad1a719b57c24d2f5302fedb41c14fbdd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F42 5612 bytes
font_01_sfnt_off00007224.bin
e7a45bbb49175e0f67cb40be4ae9dd367349cff6a40a881ff1cf634262a51d7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7224 9712 bytes

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