Malicious PDF — malware analysis report

Static analysis result for SHA-256 824d58cb91996ebc…

MALICIOUS

PDF

51.9 KB Created: 2020-08-11 04:38:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2171b45c4110a7a8f336d8cdc1ce16fb SHA-1: 8b43821df5129d405c28ca7ee10d5d75132413a6 SHA-256: 824d58cb91996ebc932bbbfdec5176555b370873b20c1fe7931096ec12471e04
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains a URL that appears to be part of the link farm. This suggests a likely attack pattern involving SEO spam or phishing, leveraging the embedded links to direct users to malicious sites.

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=averrhoa+carambola+pdf
    • http://talese.meadowhillfarmcv.com/uploads/1/3/0/8/130873804/82be1da56e6c.pdf
    • http://files.legacytattoospiercing.com/uploads/1/3/1/4/131437037/gapepajulidu_nugukofiro_mafidukefikos_bibesowobara.pdf
    • http://files.crosstowncharityweek.org/uploads/1/3/2/6/132695248/5263278.pdf
    • http://files.leathaliberty.com/uploads/1/3/0/8/130873918/dodefar-jekev-livugodul-gutixoditaw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2114/8061/files/56381805414.pdf
    • https://cdn.shopify.com/s/files/1/0432/5136/8104/files/53127675185.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sezam.pdf
    • https://cdn.shopify.com/s/files/1/0431/1767/4656/files/boxing_training_plan.pdf
    • https://cdn.shopify.com/s/files/1/0430/9254/1589/files/25897233786.pdf
    • https://cdn.shopify.com/s/files/1/0433/6641/6534/files/62346462354.pdf
    • https://cdn.shopify.com/s/files/1/0438/1265/1170/files/18060262437.pdf
    • https://cdn.shopify.com/s/files/1/0432/7600/9632/files/19701653845.pdf
    • https://cdn.shopify.com/s/files/1/0433/7300/2902/files/vijomegerakesekixixeg.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1261535930.pdf
    • https://cdn.shopify.com/s/files/1/0427/9340/2534/files/3331100820.pdf
    • https://cdn.shopify.com/s/files/1/0432/1116/1768/files/luruvusekuwoxagavek.pdf
    • https://cdn.shopify.com/s/files/1/0431/2757/0596/files/56153164726.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_off00008c64.bin
ec5ba3100a7d637f40e26cad8a9564f372fe90aa0eaaae2b4d40d23d3591176f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C64 5404 bytes
font_01_sfnt_off00009ea3.bin
5115db9da7092889026cce696141573cc6cff0fe53f9422638854e9ac5cb7242		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EA3 10320 bytes

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