Malicious PDF — malware analysis report

Static analysis result for SHA-256 1765ab51d382d57c…

MALICIOUS

PDF

73.7 KB Created: 2020-08-02 17:16:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a78d75118cde14820d733b927de84ba SHA-1: 109431953bdda26bf4b76f1929971c8e00dddd1d SHA-256: 1765ab51d382d57c670ede2b231f41ff9d1eeba496f734fd1bbcc2e3c62047c5
154 Risk Score

Malware Insights

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

The PDF document contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though heavily obfuscated, contains references to a '2015 chrysler 200 owners manual' and the authoring application 'wkhtmltopdf', suggesting a lure to disguise the malicious intent. The primary malicious IOC is the redirector URL.

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.ru/pify?keyword=2015+chrysler+200+owners+manual
    • http://files.atalayasar.org/uploads/1/3/0/7/130776573/8900868.pdf
    • http://files.firstmatemarine.com/uploads/1/3/0/9/130969041/1959682.pdf
    • http://files.fresnohighcheer.com/uploads/1/3/0/7/130738738/e534d.pdf
    • http://bowutun.placementandbusiness.com/uploads/1/3/2/3/132303230/sizopukav.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/1392/2206/files/ruvikina.pdf
    • https://cdn.shopify.com/s/files/1/0432/2829/9427/files/4426231191.pdf
    • https://cdn.shopify.com/s/files/1/0433/2843/8440/files/mimikirewaga.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rasamonuje.pdf
    • https://cdn.shopify.com/s/files/1/0431/5280/1954/files/godupujojabowam.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2089/files/pojikosoz.pdf
    • https://cdn.shopify.com/s/files/1/0433/9964/3297/files/lijagigoxasonoke.pdf
    • https://cdn.shopify.com/s/files/1/0432/4904/1563/files/95686212585.pdf
    • https://cdn.shopify.com/s/files/1/0434/0236/3045/files/fowupix.pdf
    • https://cdn.shopify.com/s/files/1/0431/5293/3018/files/72010887496.pdf
    • https://cdn.shopify.com/s/files/1/0432/3105/1943/files/pavawinunosusifu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3534/4539/files/13843681868.pdf
    • https://cdn.shopify.com/s/files/1/0435/5417/7183/files/simemid.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_off0000cba9.bin
1826b8de36bb75f721fb8442b6d29164944dde6982bb4451ffc2f974aa0e4516		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA9 5588 bytes
font_01_sfnt_off0000de9e.bin
080cf6e43e8e33001dc743bbffd6f84a3e7cdf6ee69bc3c181ca33f13cf9a178		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9E 11012 bytes
font_02_sfnt_off00010477.bin
c43c81af3addadc619f1b50b0eb79006c69e58cb90abf43f7a5fbd940e22698c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10477 16060 bytes

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