Malicious PDF — malware analysis report

Static analysis result for SHA-256 0878367a558085a4…

MALICIOUS

PDF

120.8 KB Created: 2020-07-27 03:04:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3eb75a85053fbde8a63539d782febd90 SHA-1: a93803048201647e59f8c92eeddce39e3760ebf7 SHA-256: 0878367a558085a45a7e3d3789181d2964ce725319a337309fbf44db347408c6
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 a redirector service known for malicious activity. The document body, though heavily obfuscated, suggests it is presented as a template, likely to trick users into clicking the malicious links. 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/pify?keyword=deped+order+no.+44+s.+2015+template
    • http://files.bodiedbyshalee.com/uploads/1/3/0/8/130813667/jidajulotatoge_wuvuzikare_winikanazozaxat.pdf
    • http://files.nayastergiou.com/uploads/1/3/1/4/131409761/5415582.pdf
    • http://files.lagrangehorse.com/uploads/1/3/1/3/131383665/6dd7bab24de8616.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/9010/8833/files/43157314627.pdf
    • https://cdn.shopify.com/s/files/1/0436/5497/1557/files/53341620751.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pejuzesuloroxutebed.pdf
    • https://cdn.shopify.com/s/files/1/0435/8491/3563/files/71894257132.pdf
    • https://cdn.shopify.com/s/files/1/0432/1175/1588/files/92106027151.pdf
    • https://cdn.shopify.com/s/files/1/0428/0533/0083/files/67129088656.pdf
    • https://cdn.shopify.com/s/files/1/0431/8278/4676/files/96099131497.pdf
    • https://cdn.shopify.com/s/files/1/0433/8440/6181/files/moteteterekogi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/64630415929.pdf
    • https://cdn.shopify.com/s/files/1/0430/8592/2466/files/wukomiwikotol.pdf
    • https://cdn.shopify.com/s/files/1/0431/7878/6965/files/duxunejoxeretigexetozevus.pdf
    • https://cdn.shopify.com/s/files/1/0438/9512/8216/files/jonif.pdf
    • https://cdn.shopify.com/s/files/1/0430/3316/5986/files/77957780032.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_off00019758.bin
d03d97a42a2981e6cb9a3e3cd21d06e7ed2d1776387c083997c85401615ff389
pdf-font-stream PDF embedded font (sfnt) at offset 0x19758 5416 bytes
font_01_sfnt_off0001a9bc.bin
4fca30ef25916e318ebae54ddd4821f0662cf47444e5d68a4730edf1cca1f677
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A9BC 13536 bytes