Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a24f631eb0079d2…

MALICIOUS

PDF

58.2 KB Created: 2020-08-24 18:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e53ef2f1527385c8cd537335dfca00e SHA-1: 42328b8d6344e2f577d7dd8848cdcf6caf5af548 SHA-256: 1a24f631eb0079d240d221aaef2acabb3d109bd1b8d54b6b763f77e3ae84ee29
150 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/pify?keyword=behavioural+interview+answers'. The document body, though heavily obfuscated, contains the same URL and text related to 'Behavioural interview answers', indicating a lure. The file also exhibits characteristics of a link farm, with numerous embedded URLs, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=behavioural+interview+answers
    • http://mugewoxi.spinesurgerycleveland.com/uploads/1/3/0/7/130739192/talodaf-lofidogimot-sademilitexe-pizugetigukipet.pdf
    • https://cdn.shopify.com/s/files/1/0435/5352/1823/files/59179486987.pdf
    • https://cdn.shopify.com/s/files/1/0432/2898/7547/files/nokaf.pdf
    • https://cdn.shopify.com/s/files/1/0437/5586/4215/files/maternity_leave_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0430/0318/3258/files/lojumujovefari.pdf
    • https://cdn.shopify.com/s/files/1/0436/0637/6611/files/11788543991.pdf
    • https://cdn.shopify.com/s/files/1/0449/4550/6459/files/deep_learning_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/4493/7628/files/torejogodedox.pdf
    • https://cdn.shopify.com/s/files/1/0462/6415/6314/files/caccini_ave_maria_violin.pdf
    • https://cdn.shopify.com/s/files/1/0432/6627/7534/files/68232494868.pdf
    • https://cdn.shopify.com/s/files/1/0436/7260/0726/files/55821181362.pdf
    • https://cdn.shopify.com/s/files/1/0437/9010/6775/files/azitromicina_900_bula.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000087c9.bin
cad0d155ac6977ecab62046761b80276123e6888ee7bcccc7cb06fadb2051c0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87C9 4972 bytes
font_01_sfnt_off000098bb.bin
6d2a3a16cc464ce72cf05976c7f96a31c93af2202e0dc760c37a694345e222ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98BB 1800 bytes
font_02_sfnt_off0000a14b.bin
7c8c98ccd62a492f7e88b1d6e671d21691b59a7d0cded17fde4bba4cce168f7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA14B 10576 bytes
font_03_sfnt_off0000c562.bin
b2563e85233037e3c2780690ed1455257f868516b5a962e54e6ffe29314c9cb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC562 16312 bytes

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