Malicious PDF — malware analysis report

Static analysis result for SHA-256 82b2c3048f25c9d2…

MALICIOUS

PDF

40.3 KB Created: 2020-08-23 08:46:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 56ddfa58d2a62396b343ae4140dfd58f SHA-1: 66306437f0cf7662cc57d73de8c2e26fb9d7f722 SHA-256: 82b2c3048f25c9d24993827eab3a55023846ea9559ee2c60b23f5cf5783627e2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the malicious URL and appears to be a lure for free software, likely to trick users into clicking the malicious links.

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=commandos+2+pc++free
    • http://xezese.villacreative.org/uploads/1/3/1/4/131408899/rumivasibanave.pdf
    • http://files.architecturaldesigner.world/uploads/1/3/0/7/130775506/1922816.pdf
    • http://files.nyimafoundation.org/uploads/1/3/1/3/131381712/jadenezixirifepanove.pdf
    • http://files.nikepalmettocupsc.com/uploads/1/3/1/4/131409210/nikegi.pdf
    • http://vepisu.kristysfineart.com/uploads/1/3/2/6/132681337/342bec45661de.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0445/6900/2143/files/atkins_quimica.pdf
    • https://cdn.shopify.com/s/files/1/0429/0481/3721/files/ugly_dolls_trailer.pdf
    • https://cdn.shopify.com/s/files/1/0427/9648/2727/files/79680787192.pdf
    • https://cdn.shopify.com/s/files/1/0431/8606/1480/files/nokiligugoxetevizibuwuz.pdf
    • https://cdn.shopify.com/s/files/1/0450/6553/5638/files/ashes_in_the_snow_book.pdf
    • https://cdn.shopify.com/s/files/1/0429/2460/5599/files/manualidades_botellas_decoradas_con_servilletas.pdf
    • https://cdn.shopify.com/s/files/1/0431/4837/8280/files/what_is_mchc_in_hematology_report.pdf
    • https://cdn.shopify.com/s/files/1/0430/4656/8098/files/xakuligagomijefu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0652/4583/files/bukavisoxus.pdf
    • https://cdn.shopify.com/s/files/1/0437/9367/8497/files/78617582946.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_off00005dde.bin
71a4399b111253d1b79e4838e4164f6f6ba9eedee44308799a90b259baf2e173
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DDE 5308 bytes
font_01_sfnt_off00006fcd.bin
299278899733db9df86df3cc766b35977a3b492737a50852340cf553ac28c475
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FCD 10724 bytes