Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfe708134af6cce0…

MALICIOUS

PDF

42.1 KB Created: 2020-08-30 09:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a8437f83e5f36edc9f83c0048421872 SHA-1: cd77433e72fdb55150b281b0ccb02c277ca9d0b9 SHA-256: dfe708134af6cce03a0d8e79fff2ffb06a5c31b25147529e6e43bda16691ca66
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector. The ML classifier also flagged this PDF as malicious. The presence of a link farm suggests an attempt to manipulate search engine results or distribute content through multiple benign-looking domains, ultimately leading to the malicious redirector. The document body contains garbled text but includes the malicious URL.

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/wix?keyword=the+surge+drone+modules
    • https://cdn.shopify.com/s/files/1/0431/5090/1402/files/99175770864.pdf
    • https://cdn.shopify.com/s/files/1/0450/7087/6835/files/41964265506.pdf
    • https://cdn.shopify.com/s/files/1/0431/7259/3832/files/52395611262.pdf
    • https://cdn.shopify.com/s/files/1/0440/7784/2597/files/wanamigokuvekirepuxelisix.pdf
    • https://cdn.shopify.com/s/files/1/0431/8383/3249/files/bamatewanupanisaligeve.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/38343767218.pdf
    • https://cdn.shopify.com/s/files/1/0443/0761/1804/files/9179824322.pdf
    • https://cdn.shopify.com/s/files/1/0430/1671/6437/files/kawonemenosifuvufep.pdf
    • https://cdn.shopify.com/s/files/1/0435/6761/2063/files/janujogopewilebu.pdf
    • https://cdn.shopify.com/s/files/1/0429/2748/9183/files/45320414519.pdf
    • https://static.usrfiles.com/ugd/d01287_57f7c98b050945848a26b5f2ade81151.pdf
    • https://static.usrfiles.com/ugd/b8c837_dd683b0eeb184becba5b53404da3e5b5.pdf
    • https://static.usrfiles.com/ugd/a1fb72_396d46e68a244bd59bae198e22a8890c.pdf
    • https://static.usrfiles.com/ugd/b8c837_9b9270f295854ca2850a45c6260834a3.pdf
    • https://cdn.shopify.com/s/files/1/0435/2029/5064/files/zagisexevuzuvuverekuz.pdf
    • https://cdn.shopify.com/s/files/1/0432/9095/1846/files/calypso_song_muzmo._ru.pdf
    • https://cdn.shopify.com/s/files/1/0429/8794/6143/files/oxford_collocation_dictionary_download.pdf
    • https://cdn.shopify.com/s/files/1/0441/0900/4952/files/bootstrap_websites_templates_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f5e.bin
9ebc7052b02113f3b7c16adc8089556d2bc9f11104a9bb94cab044cc4a678f71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F5E 1556 bytes
font_01_sfnt_off00006746.bin
863b51d5f149abf025afb515bd4605a8d29656ad3e5dd79e0e44c6ab10974e20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6746 4976 bytes
font_02_sfnt_off000077fe.bin
d3134bb71b2b13e4f5de1bd1b2589492b9d25a09a4fe9b09df0f88043ba92350		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77FE 10392 bytes

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