Malicious PDF — malware analysis report

Static analysis result for SHA-256 16c09c8c68731595…

MALICIOUS

PDF

40.3 KB Created: 2020-08-24 23:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a25a39247bad19519a57f25e509824f6 SHA-1: b804cd70d2c3bb272f3154a1acbcd625d1e379ae SHA-256: 16c09c8c68731595d62fcc0100b978ba5c00464dc26738d24ed8dedc6866e77c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to a redirector service. The document body text and a specific URL suggest a lure related to an 'Android app for windows'. The ML classifier and critical heuristics strongly indicate malicious intent, likely to redirect users to malicious infrastructure.

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=android+app+for+windows
    • http://files.teambirths.com/uploads/1/3/0/7/130775002/tazabir.pdf
    • http://jikoxeg.hishandsreader.org/uploads/1/3/1/6/131606420/goxiketanoxo-feputopijil-domul.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/0709/8529/files/android_bitmap_set_scale.pdf
    • https://cdn.shopify.com/s/files/1/0434/0360/8231/files/accounting_and_finance_an_introduction_8th_edition_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/5045/0600/files/87933395942.pdf
    • https://cdn.shopify.com/s/files/1/0430/6662/2106/files/xebonaxujuni.pdf
    • https://cdn.shopify.com/s/files/1/0433/6700/6364/files/37160647150.pdf
    • https://cdn.shopify.com/s/files/1/0436/1335/6189/files/20799370199.pdf
    • https://cdn.shopify.com/s/files/1/0435/6875/8943/files/logukozateno.pdf
    • https://cdn.shopify.com/s/files/1/0435/4270/8378/files/loan_format_in_marathi.pdf
    • https://cdn.shopify.com/s/files/1/0439/2163/7544/files/queen_gambit_declined_sadler.pdf
    • https://cdn.shopify.com/s/files/1/0430/4060/4313/files/wuretisamizibobig.pdf
    • https://cdn.shopify.com/s/files/1/0438/2480/8096/files/wuwijizunudekekarekabawut.pdf
    • https://cdn.shopify.com/s/files/1/0437/0743/3125/files/gufemevuxilugin.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/44190670049.pdf
    • https://cdn.shopify.com/s/files/1/0432/4281/5643/files/jotilesadigeviwowe.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_off00006021.bin
45c7d8ee2cb5bf27f629f0d7d69db39d612c5cfdfd0dc1b5223ae7e5bcdafa16
pdf-font-stream PDF embedded font (sfnt) at offset 0x6021 5084 bytes
font_01_sfnt_off0000718b.bin
a40b30457b41df1ce34e255e7808693ef0323e533c849bdc6c749f986d8121b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x718B 10236 bytes