Malicious PDF — malware analysis report

Static analysis result for SHA-256 13b690561a630c4b…

MALICIOUS

PDF

44.2 KB Created: 2020-07-21 02:15:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 83dc8a49c27948fdc7d57f6b56ef7bc8 SHA-1: e5d6b86b086127c507da553bfc7a676ef379802d SHA-256: 13b690561a630c4ba8b9180a9ec25f17377dd694f0a1577516da11ad2e58d329
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of embedded links, many pointing to what appears to be an SEO link farm, with one critical link identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the document's structure and embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

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/wb?keyword=medical%20terminology%20for%20interpreters%20a%20handbook%20pdf
    • http://files.stewartvillecommunitytheatre.org/uploads/1/3/2/8/132815054/xotuxisazebapu.pdf
    • http://files.pfrangassociation.org/uploads/1/3/0/7/130776619/9640502.pdf
    • http://files.gatewayhotel.com/uploads/1/3/2/6/132695339/61a6f2a7b731a6.pdf
    • http://files.apollosmartbet.com/uploads/1/3/1/6/131607662/pejapivirebo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/0179/1132/files/15645436424.pdf
    • https://cdn.shopify.com/s/files/1/0429/6717/1223/files/46244372869.pdf
    • https://cdn.shopify.com/s/files/1/0430/1130/9719/files/81022463550.pdf
    • https://cdn.shopify.com/s/files/1/0427/8134/3903/files/wujajabu.pdf
    • https://cdn.shopify.com/s/files/1/0427/6404/2396/files/89749234483.pdf
    • https://zukiner236937513.files.wordpress.com/2020/07/lalatofogape.pdf
    • https://gezuduropen419134146.files.wordpress.com/2020/07/95114652612.pdf
    • https://lamofozeguve.files.wordpress.com/2020/07/57998100433.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/libidurekatomanazavevufi.pdf
    • https://cdn.shopify.com/s/files/1/0430/0800/0163/files/50083474771.pdf
    • https://cdn.shopify.com/s/files/1/0431/5417/8216/files/mifejijaxulugibiku.pdf
    • https://cdn.shopify.com/s/files/1/0440/1889/2958/files/23705927678.pdf
    • https://cdn.shopify.com/s/files/1/0434/4047/2214/files/75008055602.pdf
    • https://cdn.shopify.com/s/files/1/0430/0275/7281/files/94374174226.pdf
    • https://cdn.shopify.com/s/files/1/0438/0003/5485/files/wuluvujivasabidenubepej.pdf
    • https://cdn.shopify.com/s/files/1/0429/6628/6490/files/panepovaxi.pdf
    • https://cdn.shopify.com/s/files/1/0431/2766/8890/files/7901598747.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_off00006cbf.bin
e09c31cc8eaca997022d87bb72b972544659b85c31fee35b53186268fba934ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CBF 5668 bytes
font_01_sfnt_off00007fdc.bin
b505baa5b3a5f6e01f2b72dee3c5b5c49f7db8831b31466c086316435d195ba0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FDC 10140 bytes

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