Malicious PDF — malware analysis report

Static analysis result for SHA-256 13b3580bacc50462…

MALICIOUS

PDF

40.9 KB Created: 2020-08-06 17:51:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 082fdb591db5d8a6568ec4422188ddcb SHA-1: 4fd38773055185ca67d15c3a57b3d8e5b3599001 SHA-256: 13b3580bacc5046266dee524d1edabd06564bb27aac69b7bbdd9d75e92cf2f03
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to domains associated with link farms and redirectors, indicating a phishing or malicious redirection attempt. The primary malicious URL identified is https://ttraff.ru/pify?keyword=bmi+chart+nhs+pdf, which 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.ru/pify?keyword=bmi+chart+nhs+pdf
    • http://files.mokilart.com/uploads/1/3/1/4/131438667/7423723.pdf
    • http://files.mississippinativeplantsociety.org/uploads/1/3/0/8/130874377/guxewetato.pdf
    • http://files.blueheronstainedglass.net/uploads/1/3/1/3/131382346/ac728f2.pdf
    • http://files.kwigsnstyles.com/uploads/1/3/1/3/131398102/desikisev.pdf
    • http://josiso.studentvoicesnyc.org/uploads/1/3/0/7/130775795/4918864.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/8669/9925/files/abraham_maslow_s_need_hierarchy_theory.pdf
    • https://cdn.shopify.com/s/files/1/0431/5627/5362/files/sharp_carousel_microwave_manual.pdf
    • https://cdn.shopify.com/s/files/1/0440/2230/0822/files/68041429356.pdf
    • https://cdn.shopify.com/s/files/1/0437/2935/4903/files/bubajulotowotadila.pdf
    • https://cdn.shopify.com/s/files/1/0435/4116/8283/files/89299094946.pdf
    • https://cdn.shopify.com/s/files/1/0432/8390/6724/files/5197846280.pdf
    • https://cdn.shopify.com/s/files/1/0433/2548/9320/files/brios_fair_oaks.pdf
    • https://cdn.shopify.com/s/files/1/0437/3938/1912/files/75279066393.pdf
    • https://cdn.shopify.com/s/files/1/0432/3190/3902/files/46899780663.pdf
    • https://cdn.shopify.com/s/files/1/0429/5199/9637/files/crossfit_training_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/7428/8793/files/gear_vr_disable.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_off000062d8.bin
40ce329d605381fd908e207e6edfbbed8a0104ea7e7e518704e4068853e4d46b
pdf-font-stream PDF embedded font (sfnt) at offset 0x62D8 5412 bytes
font_01_sfnt_off00007514.bin
6ac237b157bfa118bc286920feda2c044e1cf636cb412e3f89d37d2137d2fc7b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7514 9936 bytes