Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f3719d0cb4a1191…

MALICIOUS

PDF

41.1 KB Created: 2020-08-04 06:11:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7d82d219fc53aa0f92369878a1cf8a0 SHA-1: 34eb9baee50679db720cf306d8ffd0d04d02597b SHA-256: 3f3719d0cb4a1191b9eed09dd4b9fd0d67fc78e128cb4a223bbfb2ff9bcd3759
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a mass external link farm, with one URL pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the target URL and appears to be a lure related to 'Blender 2.79 shortcut keys'. The ML classifier strongly indicates maliciousness. The primary attack vector is likely a phishing attempt via a malicious link embedded within the PDF.

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=blender+2.+79+shortcut+keys+pdf
    • http://files.saraindus.com/uploads/1/3/1/0/131071157/nugukomevewug.pdf
    • http://files.apeacefulfarewell.com/uploads/1/3/0/8/130874676/9202712.pdf
    • http://files.powsfsu.org/uploads/1/3/2/6/132696335/7256474.pdf
    • http://files.lizremphreyshowhorses.com/uploads/1/3/1/4/131453904/tabutip.pdf
    • https://cdn.shopify.com/s/files/1/0432/5716/8027/files/wesejepig.pdf
    • https://cdn.shopify.com/s/files/1/0427/3173/3159/files/algebra_questions_for_ssc.pdf
    • https://cdn.shopify.com/s/files/1/0438/4686/0957/files/mom_son_3d_sex.pdf
    • https://cdn.shopify.com/s/files/1/0435/5905/9615/files/45669977214.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gifowugebivagobawogun.pdf
    • https://cdn.shopify.com/s/files/1/0431/7449/4369/files/the_duchess_of_malfi_download.pdf
    • https://cdn.shopify.com/s/files/1/0440/6309/6984/files/vonaxolutijuwepabowawapol.pdf
    • https://cdn.shopify.com/s/files/1/0431/5679/9647/files/rowufimixazewodejajosa.pdf
    • https://cdn.shopify.com/s/files/1/0436/1093/1358/files/teluxelilitilabovove.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/84860081798.pdf
    • https://cdn.shopify.com/s/files/1/0430/1137/5267/files/99707422238.pdf
    • https://cdn.shopify.com/s/files/1/0434/6180/4197/files/7639929461.pdf
    • https://cdn.shopify.com/s/files/1/0430/8549/6482/files/70276512975.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_off00005ff8.bin
416b0aaeac1a277ea7e2bec630c1cd5e8a352f66215d68f2dab7abdb61f13d02
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FF8 5648 bytes
font_01_sfnt_off00007346.bin
fb610a1510d2f05659a13b56c6d65783605a966c1a8ec659e3dbfb679fc82a15
pdf-font-stream PDF embedded font (sfnt) at offset 0x7346 10704 bytes