Malicious PDF — malware analysis report

Static analysis result for SHA-256 c44bc29706e7c9d4…

MALICIOUS

PDF

44.9 KB Created: 2020-08-02 21:30:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce2a645915b980267cc9a2bd7ee4ac97 SHA-1: cf82efd895131b8ed9c79f90ceed487e3166faa7 SHA-256: c44bc29706e7c9d49e5e2eddb5ce6d1f5c395196ff18bdecc9347f22f6c897c2
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com, and one critical link redirects to ttraff.com, which is known malicious infrastructure. The document body and metadata suggest a lure related to web design, likely intended to trick users into clicking the malicious redirector.

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=fundamentals%20of%20web%20designing%20pdf
    • http://files.zhaobaotaichi.com/uploads/1/3/1/4/131406736/8495509.pdf
    • http://files.helpingthoseleftbehind.com/uploads/1/3/0/9/130969772/8601755.pdf
    • http://files.hellokaelo.com/uploads/1/3/0/7/130776599/lapig-gobom-xubimiwenajavew-wetugotabepo.pdf
    • http://files.lanierspeechanddebate.org/uploads/1/3/1/4/131406434/taxokemuniwamol-fibefilofotu-mixevuvi.pdf
    • http://files.erawan-hiroshima.com/uploads/1/3/1/3/131379042/rikiwixuva_towipozukusut_sexuvasimufob.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8867/files/rubakido.pdf
    • https://cdn.shopify.com/s/files/1/0429/0789/3919/files/mebodimebu.pdf
    • https://cdn.shopify.com/s/files/1/0427/7813/2636/files/xudozobu.pdf
    • https://cdn.shopify.com/s/files/1/0429/1064/6435/files/73747989923.pdf
    • https://cdn.shopify.com/s/files/1/0432/8351/3494/files/viwezifujudavukebisomab.pdf
    • https://cdn.shopify.com/s/files/1/0428/1594/6918/files/throw_some_mo_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/8909/9938/files/12606231543.pdf
    • https://cdn.shopify.com/s/files/1/0433/0654/9406/files/17711004860.pdf
    • https://cdn.shopify.com/s/files/1/0435/2252/3288/files/gufikulexoworatix.pdf
    • https://cdn.shopify.com/s/files/1/0433/7827/8550/files/77128935456.pdf
    • https://cdn.shopify.com/s/files/1/0429/6356/6755/files/28358882007.pdf
    • https://cdn.shopify.com/s/files/1/0437/5920/6558/files/office_2016_for_mac.pdf
    • https://cdn.shopify.com/s/files/1/0431/5637/3670/files/47990747546.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000712a.bin
db3ca966857e706a836d22d78679baadc66c17a4f9c15d3f9c7614942bfc89be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x712A 5452 bytes
font_01_sfnt_off000083ba.bin
39dd1fd5b511419771792b9fcf3361868b6aeb2e0db6876949b17c45cba453dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83BA 10244 bytes

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