Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a27a773dffa8388…

MALICIOUS

PDF

48.6 KB Created: 2020-09-01 03:01:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7932cb0ebdf9d207b897d624def57aa7 SHA-1: 3d5d12d5e4f2c435d644b49e968f46ad99bd2f18 SHA-256: 7a27a773dffa8388caf091a6a65a877eaf4c4e3c9950cb3619f24abffd93e0dc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to Shopify-hosted PDFs, which is indicative of a link farm used to obscure malicious infrastructure. One of the primary URLs, 'https://ttraff.com/wix?keyword=bareilly+ki+barfi+film', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness.

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/wix?keyword=bareilly+ki+barfi+film
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4783/7083/files/nokia_android_4g_phone_under_8000.pdf
    • https://cdn.shopify.com/s/files/1/0430/7084/9181/files/73616719421.pdf
    • https://cdn.shopify.com/s/files/1/0432/5982/2243/files/sotifufex.pdf
    • https://cdn.shopify.com/s/files/1/0437/1467/4841/files/cassation_decision_volume_18.pdf
    • https://cdn.shopify.com/s/files/1/0428/9573/6988/files/dofojujosok.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wojilezufaguxulidumusad.pdf
    • https://cdn.shopify.com/s/files/1/0427/9946/4611/files/8509450699.pdf
    • https://cdn.shopify.com/s/files/1/0434/6321/3209/files/4mat_learning_styles.pdf
    • https://cdn.shopify.com/s/files/1/0464/5525/9304/files/53325766480.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/4780083199.pdf
    • https://cdn.shopify.com/s/files/1/0432/0067/6003/files/ofccp_technical_assistance_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/22271122494.pdf
    • https://cdn.shopify.com/s/files/1/0437/6366/3009/files/48014171479.pdf
    • https://cdn.shopify.com/s/files/1/0428/2561/3475/files/advantages_and_disadvantages_of_direct_marketing.pdf
    • https://cdn.shopify.com/s/files/1/0428/1411/1903/files/free_sports_tv_app.pdf
    • https://cdn.shopify.com/s/files/1/0428/6060/9692/files/goximozebezixekebumo.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006bd5.bin
36c0d60d802a130047aed250029d04e45d905ef78bb48204a285a95a70ab1380		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BD5 5092 bytes
font_01_sfnt_off00007d21.bin
be2a6b5c7f949b9f5eaad00fc8a978ed1934086ef905f1dabe8dd9f67cd12742		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D21 10136 bytes
font_02_sfnt_off0000a02a.bin
ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA02A 16164 bytes

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