Malicious PDF — malware analysis report

Static analysis result for SHA-256 c05e2726529058f9…

MALICIOUS

PDF

43.1 KB Created: 2020-08-05 02:27:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef5d0f51b2d1d4c9ad2fb06ee08c7126 SHA-1: 185ad04bd681a96c05fc412bf8ea8933b611e33e SHA-256: c05e2726529058f92acce4969a05094f171e5483c708290bc763ca2b7490c67e
152 Risk Score

Malware Insights

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

The PDF contains a link farm and a redirector to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The document body, though heavily obfuscated, contains the URL https://ttraff.cc/pify?keyword=how+to+use+digital+multimeter+for+mobile+repairing+pdf, suggesting a lure to a malicious site. The ML classifier also strongly flagged this PDF as malicious.

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=how+to+use+digital+multimeter+for+mobile+repairing+pdf
    • http://files.hmongstudiesjournal.org/uploads/1/3/0/9/130969048/1166394.pdf
    • http://files.britefulbiz.com/uploads/1/3/1/0/131070230/wakegisisijiwasepu.pdf
    • http://files.mhsfca.net/uploads/1/3/0/8/130874326/sevosado_pawivibegirusen.pdf
    • http://files.coachchriswoodside.com/uploads/1/3/0/7/130740123/wewosixo_busidalamixejup_lefifogulusujuf_zinanuzakole.pdf
    • http://files.rombi.org/uploads/1/3/2/6/132683224/wilasejafipawuki.pdf
    • https://cdn.shopify.com/s/files/1/0432/2433/4496/files/2280641585.pdf
    • https://cdn.shopify.com/s/files/1/0430/3713/0914/files/finasatagij.pdf
    • https://cdn.shopify.com/s/files/1/0434/1425/7820/files/88813234445.pdf
    • https://cdn.shopify.com/s/files/1/0451/0230/1349/files/ap_french_vibrations_and_waves.pdf
    • https://cdn.shopify.com/s/files/1/0429/2768/5799/files/556715435.pdf
    • https://cdn.shopify.com/s/files/1/0436/9448/9755/files/47625006445.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/13652925252.pdf
    • https://cdn.shopify.com/s/files/1/0433/6159/9656/files/29358477922.pdf
    • https://cdn.shopify.com/s/files/1/0430/9162/4096/files/39380219250.pdf
    • https://cdn.shopify.com/s/files/1/0431/3179/7668/files/segokasivapatanixorax.pdf
    • https://cdn.shopify.com/s/files/1/0432/9324/5600/files/fezibegapujolepin.pdf
    • https://cdn.shopify.com/s/files/1/0433/2745/5400/files/74466535499.pdf
    • https://cdn.shopify.com/s/files/1/0432/2571/0750/files/33186526761.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_off00006a0e.bin
8aa436822d7644472b48ea515feec1801e16f4040daaab234385000cde9b9643		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A0E 5552 bytes
font_01_sfnt_off00007ce5.bin
f4bd543baa6df7265257341d8ef7a6eb1db09027b8679dee3b321e8412eea698		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CE5 9896 bytes

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