Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fec17fe10aa6c20…

MALICIOUS

PDF

54.1 KB Created: 2020-08-10 10:37:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8488c8de29a00544ce9faa36b9a090b SHA-1: 5437ea5cd7679059aa36a56e5b0d5ca374b0f50b SHA-256: 7fec17fe10aa6c2093b5225b1f602a6d9d1b56b29f88c2cf6411876ae1c23a18
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to a link farm designed to generate SEO traffic. One of the embedded URLs, https://ttraff.cc/pify?keyword=j%25C4%2599zyk+angielski+s%25C5%2582ownictwo+tematyczne+pdf, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text related to English vocabulary and the malicious URL, suggesting a lure to a phishing or scam page.

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=j%25C4%2599zyk+angielski+s%25C5%2582ownictwo+tematyczne+pdf
    • http://files.jennifergelber.com/uploads/1/3/1/8/131871648/596328a1.pdf
    • http://files.bigdogrottweilers.com/uploads/1/3/1/4/131406785/kidigiva_wenoso_sudaju.pdf
    • http://sukitup.bespokecarpentry.org/uploads/1/3/1/6/131606490/7827143.pdf
    • http://files.dragonmoononline.com.au/uploads/1/3/0/7/130738740/91335fc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/5154/7800/files/zepoziginagotasuzese.pdf
    • https://cdn.shopify.com/s/files/1/0436/3295/1446/files/atomic_mass_of_first_30_elements_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/3874/4469/files/amharic_english_alphabet.pdf
    • https://cdn.shopify.com/s/files/1/0432/0493/5835/files/fuxazunugogoxuwesosu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6640/0663/files/memotod.pdf
    • https://cdn.shopify.com/s/files/1/0430/8185/9225/files/92126969254.pdf
    • https://cdn.shopify.com/s/files/1/0434/6295/1074/files/tesize.pdf
    • https://cdn.shopify.com/s/files/1/0439/1705/0008/files/wegowaxemetotonomaxo.pdf
    • https://cdn.shopify.com/s/files/1/0436/5441/4494/files/12027065839.pdf
    • https://cdn.shopify.com/s/files/1/0432/2174/5823/files/neposumizome.pdf
    • https://cdn.shopify.com/s/files/1/0431/7341/3032/files/88690661277.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000082b7.bin
f00dbaaf746db52f7e5ef5a56dc92f202e259a89b76a1b0e313129e62ec3a655		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82B7 5700 bytes
font_01_sfnt_off000095f3.bin
93d352be40e51f4c8bc3b13de9c0bbb16afe32113b511ece9294de5c7135b4c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95F3 11688 bytes
font_02_sfnt_off0000bac9.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBAC9 4324 bytes

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