Malicious PDF — malware analysis report

Static analysis result for SHA-256 b606606d73352dad…

MALICIOUS

PDF

35.8 KB Created: 2020-08-08 21:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 096d061bbb40a01f140ac496bfd56a85 SHA-1: 7ff1d93bb8cc48acc9fba9799594818fc9a1e740 SHA-256: b606606d73352dad0e3f68114bd0f03f055c93de7957ad151dd8f5e59c402e05
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically pointing to a known malicious redirector infrastructure. The ML classifier strongly indicated maliciousness. The document body, though partially corrupted, contains URLs that are part of a link farm, suggesting an attempt to manipulate search engine results or distribute malicious content. No scripts were extracted from this sample.

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=asexual+vs+sexual+reproduction+worksheet+pdf
    • http://files.willowfree.ca/uploads/1/3/1/6/131606475/jitiralone-tofibege-lidatomo.pdf
    • http://files.manchestertaekwondo.com/uploads/1/3/2/7/132710732/wuwowovazadudoba.pdf
    • http://files.richbrownies.com/uploads/1/3/1/4/131483830/424c10c8ec51a.pdf
    • http://files.purplehobbies.com/uploads/1/3/1/3/131384286/sibijoruleje-guvizakimote-dizufugag-jifada.pdf
    • http://bisur.bhpfineminiatures.com/uploads/1/3/1/4/131437423/virizur-demikuti-gufizuriv-fixumonusogazik.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/89397105376.pdf
    • https://cdn.shopify.com/s/files/1/0436/4189/7110/files/ffxiv_overlay_plugin.pdf
    • https://cdn.shopify.com/s/files/1/0434/4433/8854/files/80783436133.pdf
    • https://cdn.shopify.com/s/files/1/0429/7208/6423/files/alter_bridge_blackbird_guitar_tab.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/78992801071.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/9715790575.pdf
    • https://cdn.shopify.com/s/files/1/0447/3444/7770/files/closed_shop_definition.pdf
    • https://cdn.shopify.com/s/files/1/0429/1241/5897/files/86632618402.pdf
    • https://cdn.shopify.com/s/files/1/0429/5540/7519/files/the_new_oxford_annotated_bible_with_apocrypha_4th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0429/9735/0554/files/vorunewonebefimekar.pdf
    • https://cdn.shopify.com/s/files/1/0431/1213/6855/files/55160520965.pdf
    • https://cdn.shopify.com/s/files/1/0431/4103/8234/files/wixowowinawepepasobox.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f2a.bin
fd3f632c2e773ac85ea6d39aa2e67dadbd6446a99e4c0a00eeab0c3ee4eb6555		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F2A 5516 bytes
font_01_sfnt_off00006205.bin
5fef3dd7f401574b36da7bf2c592125d9954a6175a080112dc0394b50b784765		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6205 9508 bytes

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