Malicious PDF — malware analysis report

Static analysis result for SHA-256 162725fced3a2fed…

MALICIOUS

PDF

45.5 KB Created: 2020-08-01 04:39:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 519628e6ebfb99934db2c7d46baed551 SHA-1: 0b4c7fcc243e1cfe96168db4168478ca7bcb6c93 SHA-256: 162725fced3a2fed4816ae8a093475d8bf41ad4917a68af353446e2aa759b9e3
154 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to what appears to be a link farm designed to host numerous PDF files. One of the primary links, 'https://ttraff.cc/pify?keyword=rst+form+pdf', is flagged as a malicious redirector. This suggests the document's purpose is to direct users to malicious infrastructure, likely for phishing or malware distribution, rather than providing legitimate content. No scripts were extracted, but the structure and link farm indicate a malicious intent.

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=rst+form+pdf
    • http://files.closdecandele.com/uploads/1/3/1/8/131856624/29b12.pdf
    • http://files.pattieholyilenda.com/uploads/1/3/0/7/130740367/vadujuwozagoj_tuvutafe_sanikebimigos_xinuxawi.pdf
    • http://files.beetrax.com/uploads/1/3/1/4/131483217/luwinejiminikamaxe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/9443/4202/files/tarebumaxusodegadagipolo.pdf
    • https://cdn.shopify.com/s/files/1/0430/3070/8385/files/dugilukebulusifuzoj.pdf
    • https://cdn.shopify.com/s/files/1/0432/5661/0976/files/4534448064.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/78682713185.pdf
    • https://cdn.shopify.com/s/files/1/0431/6869/4432/files/60708279590.pdf
    • https://cdn.shopify.com/s/files/1/0428/2325/4179/files/63053831652.pdf
    • https://cdn.shopify.com/s/files/1/0431/3258/4098/files/jugijagisaweg.pdf
    • https://cdn.shopify.com/s/files/1/0432/9324/5600/files/jowodemogul.pdf
    • https://cdn.shopify.com/s/files/1/0431/5784/8224/files/43260759829.pdf
    • https://cdn.shopify.com/s/files/1/0440/5601/9109/files/newilabevotosalefoludegu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/puneson.pdf
    • https://cdn.shopify.com/s/files/1/0428/6241/1935/files/jerinelemebuv.pdf
    • https://cdn.shopify.com/s/files/1/0432/7450/2312/files/81112676188.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000683f.bin
e81d7d6884ca04c62c80a6d5c4c6edbc9e4939dee9b5657dcd1080c343d6d2ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x683F 4468 bytes
font_01_sfnt_off00007763.bin
ad4e0f513a23db20da22157f1e6edf9cc49067fe06f3ac03590deb1ab639779b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7763 11060 bytes
font_02_sfnt_off00009b56.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B56 4324 bytes

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