Malicious PDF — malware analysis report

Static analysis result for SHA-256 8810d815e8e14260…

MALICIOUS

PDF

40.1 KB Created: 2020-09-17 00:32:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4ac6b460246588b079bd45db1c59a8c4 SHA-1: 2ec19f44e0266b1edfbc34ed1ff3cadc6528d606 SHA-256: 8810d815e8e142609f6747e629462c6319ea5acc75dc03940b99d39a1e799c7f
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 Shopify domains hosting other PDFs, but one critical link directs to a known malicious redirector. This suggests an attempt to obscure the final malicious destination and potentially engage in SEO poisoning or link farming to distribute malware. 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.me/pify?keyword=lab+chihuahua+mix+life+expectancy
    • http://lapuw.cefmiwaynecounty.com/uploads/1/3/1/0/131070306/refovapatega_wusopemurowo_xonarif.pdf
    • http://risur.almosthomecare.com/uploads/1/3/2/6/132681946/degisegipepoxobuf.pdf
    • http://files.onelinerjokelab.com/uploads/1/3/1/4/131483336/9142254.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/4776/4647/files/net_cut_apk_pro.pdf
    • https://cdn.shopify.com/s/files/1/0433/4675/5734/files/clematis_montana_pruning_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/9942/2871/files/sisevukawufuwine.pdf
    • https://cdn.shopify.com/s/files/1/0465/0926/0958/files/kijerupis.pdf
    • https://cdn.shopify.com/s/files/1/0432/6640/8603/files/vertigo_exercises_spanish.pdf
    • https://cdn.shopify.com/s/files/1/0428/3603/3695/files/lifiturenidi.pdf
    • https://cdn.shopify.com/s/files/1/0472/3146/7685/files/periodic_tenancy_agreement_template.pdf
    • https://cdn.shopify.com/s/files/1/0430/7002/9975/files/25085172448.pdf
    • https://cdn.shopify.com/s/files/1/0438/5862/4672/files/tewozoko.pdf
    • https://cdn.shopify.com/s/files/1/0430/8126/9401/files/caderno_de_caligrafia_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/3009/3728/files/97665621481.pdf
    • https://cdn.shopify.com/s/files/1/0427/8226/1415/files/70979808123.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_off000060c1.bin
0c485389f4d8f1591b21a722806d03eb1b287ba2ccf3acf145f6ad2514dccfd9
pdf-font-stream PDF embedded font (sfnt) at offset 0x60C1 5232 bytes
font_01_sfnt_off00007281.bin
5b4e2f0caefdce547e9d8f00c480f08d6303679564143f802a43ec3e32124f20
pdf-font-stream PDF embedded font (sfnt) at offset 0x7281 9684 bytes