Malicious PDF — malware analysis report

Static analysis result for SHA-256 65197bb34507cdf3…

MALICIOUS

PDF

37.9 KB Created: 2020-07-12 06:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5b3d9bacaccb05f1e21345328fbedc0a SHA-1: 8a4adc1ba659389c8e5c44ce38e8aab23530db98 SHA-256: 65197bb34507cdf3f7de55da10b362600671b7ae20b7c5c52ed4c73b5bdf046e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The primary URL, https://ttraff.ru/pify?keyword=sennheiser+tr120+manual, is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and other links to PDF files hosted on various domains, suggesting a link farm or redirection scheme. The ML classifier strongly indicates maliciousness.

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.ru/pify?keyword=sennheiser+tr120+manual
    • http://files.rebeccalynnphotography.net/uploads/1/3/0/8/130874518/4840188.pdf
    • http://files.cierrasedgeamstaffs.com/uploads/1/3/2/3/132303151/3d9adddcee.pdf
    • http://files.processfc.com/uploads/1/3/0/7/130738755/e6f223ed31e0c2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://padozobesix.files.wordpress.com/2020/06/gazipagixidusobanodo.pdf
    • https://bakovenorow.files.wordpress.com/2020/06/ririsovepaxafo.pdf
    • https://wufubupaku.files.wordpress.com/2020/06/wapixaravorarirezezibal.pdf
    • https://nuvamodut.files.wordpress.com/2020/06/89744482945.pdf
    • https://gilunumaseg.files.wordpress.com/2020/06/lijafomutibolet.pdf
    • https://dexubifomuti.files.wordpress.com/2020/06/janojuxowipadugutuf.pdf
    • https://datugonirir.files.wordpress.com/2020/06/pugekisawedubo.pdf
    • https://nedetepu.files.wordpress.com/2020/06/nilizubagepexudonajepozo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32177526878.pdf
    • https://cdn.shopify.com/s/files/1/0429/6183/0037/files/36350521750.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sabam.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/49470024852.pdf
    • https://cdn.shopify.com/s/files/1/0433/1310/2998/files/vilomozikadapikuw.pdf
    • https://cdn.shopify.com/s/files/1/0428/3963/8179/files/15162147697.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/35035436777.pdf
    • https://cdn.shopify.com/s/files/1/0428/8095/8617/files/jowunogisotowezidixazaki.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_off000054b8.bin
805bf4d0f43ea5dbc3a547f1cbb95b283f9d4dc9b840bd8256b1601978f3242c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54B8 5124 bytes
font_01_sfnt_off000065e2.bin
9c2fd52f8f63edce3ddfc6cc3a919b80472d3dab04858b05aea9310d5d03447b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65E2 11008 bytes

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