Malicious PDF — malware analysis report

Static analysis result for SHA-256 91abbd23f8bfa929…

MALICIOUS

PDF

48.6 KB Created: 2020-07-30 04:11:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17d7a428325b8e449f87ab046499e0df SHA-1: ec6d44a58135c2925926c95127e9b6b494aae0b7 SHA-256: 91abbd23f8bfa9295706c9b928b7789fda340c392f5c0bb970eaf7542574becd
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier strongly flagged this PDF as malicious. The presence of a link farm suggests an attempt to distribute malicious content or phish users by overwhelming them with links, likely leading to a compromised site or malware download. 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.cc/pify?keyword=authority+letter+sample+pdf
    • http://files.whhcpt.co.nz/uploads/1/3/1/3/131379329/fotewirap-niwarotun-kajezenevojewa.pdf
    • http://files.blinkebeautybar.com/uploads/1/3/0/7/130739704/todezesotit.pdf
    • http://files.cosebellecollection.com/uploads/1/3/2/6/132695830/14b1afa382672.pdf
    • http://files.dioceseofquincy.org/uploads/1/3/1/1/131163780/xevugurixovaxagege.pdf
    • http://files.whhcpt.co.nz/uploads/1/3/1/3/131379329/fotewirap-niwarotun-kajeze
    • https://cdn.shopify.com/s/files/1/0432/5156/4707/files/loxakasafasu.pdf
    • https://cdn.shopify.com/s/files/1/0433/1975/4907/files/63173346011.pdf
    • https://cdn.shopify.com/s/files/1/0431/2757/0596/files/lalawuxazudixim.pdf
    • https://cdn.shopify.com/s/files/1/0437/3364/7509/files/23505017018.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/xaxotozi.pdf
    • https://cdn.shopify.com/s/files/1/0435/0479/5800/files/2648566758.pdf
    • https://cdn.shopify.com/s/files/1/0428/4717/4812/files/39769125055.pdf
    • https://cdn.shopify.com/s/files/1/0427/9812/1119/files/juwegire.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/68140815153.pdf
    • https://cdn.shopify.com/s/files/1/0431/8471/7979/files/kuranisuziwamotije.pdf
    • https://cdn.shopify.com/s/files/1/0436/4953/2069/files/wubafizoramaruxi.pdf
    • https://cdn.shopify.com/s/files/1/0430/3087/2215/files/39120786316.pdf
    • https://cdn.shopify.com/s/files/1/0436/0981/7251/files/xadututewuxifabor.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_off000080cf.bin
26c17dbfd85227e51decf38a858f16b7651f05796a40f2d09a6fb00800632305		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80CF 5148 bytes
font_01_sfnt_off0000925e.bin
c073417430b14d6481c91c52ccd62267280fe0030f6f565e1407306e315a54dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x925E 10280 bytes

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