Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2c2922eedbd93af…

MALICIOUS

PDF

64.1 KB Created: 2020-08-08 01:13:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6cc879660d3a14840fff76bb63c56da SHA-1: 1b1a45052230519f3e22e73842e2750794498c93 SHA-256: b2c2922eedbd93af83c9737e1a1c9eec481796909df61b9f1e27432cac062890
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/pify?keyword=gentamicin+mechanism+of+action+pdf'. This URL is likely used to lure victims to a malicious site. The document body, though heavily obfuscated, also contains this URL, reinforcing its malicious intent. The presence of numerous other links to PDFs hosted on CDNs suggests a link farm or SEO poisoning tactic to distribute the malicious PDF.

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=gentamicin+mechanism+of+action+pdf
    • http://files.gretchenstelter.com/uploads/1/3/0/8/130874368/mejalup.pdf
    • http://files.ivansivak.net/uploads/1/3/1/3/131398479/44b3d812cb.pdf
    • http://files.onesimplyiris.com/uploads/1/3/0/7/130776775/babon.pdf
    • https://cdn.shopi
    • https://cdn.shopify.com/s/files/1/0438/8644/4699/files/riparoziwiribe.pdf
    • https://cdn.shopify.com/s/files/1/0429/7038/2485/files/les_fournitures_scolaires_en_anglais.pdf
    • https://cdn.shopify.com/s/files/1/0432/7315/8821/files/wuzuronezomujij.pdf
    • https://cdn.shopify.com/s/files/1/0441/1287/1576/files/weder.pdf
    • https://cdn.shopify.com/s/files/1/0429/9980/8149/files/xagifeb.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/38138836364.pdf
    • https://cdn.shopify.com/s/files/1/0434/3031/4133/files/mawutodudilajeseluliti.pdf
    • https://cdn.shopify.com/s/files/1/0430/8933/0330/files/mobil_1_oil_filter_cross_reference.pdf
    • https://cdn.shopify.com/s/files/1/0432/7571/4715/files/dipoxujiribaw.pdf
    • https://cdn.shopify.com/s/files/1/0434/1386/4602/files/futenubugiwe.pdf
    • https://cdn.shopify.com/s/files/1/0427/7207/0556/files/1341631147.pdf
    • https://cdn.shopify.com/s/files/1/0432/8148/1884/files/estrategias_de_la_cadena_de_suministros.pdf
    • https://cdn.shopify.com/s/files/1/0427/5427/7532/files/12670905560.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/39094452609.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_off0000a090.bin
dbd7136beb3906dc99b20c964b46087700b6d7b9e0a262f6c83259d49ff18009		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA090 5300 bytes
font_01_sfnt_off0000b27d.bin
2f1d94243a0a854a54bc50c833e23717d3700c833b35a86ea1ed911194c03e5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB27D 12352 bytes
font_02_sfnt_off0000dbf4.bin
298a059a47d04402a822539650cb20f422186273fa20e8de9e2ef64d066f24e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF4 16160 bytes

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