Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f964417351ff2e8…

MALICIOUS

PDF

44.5 KB Created: 2020-08-11 05:53:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 699263961de9d3fa747dbdace0abe81e SHA-1: 597d2162dcbbcd854fe68aa1e1b310212054eae5 SHA-256: 6f964417351ff2e8f00a6f9cad6879aa464bb36915d719450f3217b30928c3e4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one specifically pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. This suggests the document is designed to lure users to malicious sites, likely for phishing or to download further malware.

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=lsat+logic+games+example+pdf
    • http://files.magdalenamorataya.com/uploads/1/3/1/3/131379608/sexisozoliba.pdf
    • http://files.cornhoartist.com/uploads/1/3/1/8/131857565/rugumopidikejipuzi.pdf
    • http://kapaxe.auseras.com/uploads/1/3/2/7/132710714/c4acf143c.pdf
    • http://reguwi.greateressex2020.org/uploads/1/3/1/8/131871921/6369909.pdf
    • http://files.pecanstreetchristianschool.org/uploads/1/3/0/7/130739069/goxiximo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/8125/3535/files/23172580226.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/68915295218.pdf
    • https://cdn.shopify.com/s/files/1/0432/0142/9662/files/bls_training_material.pdf
    • https://cdn.shopify.com/s/files/1/0429/0881/1427/files/cell_death_apoptosis_and_necrosis.pdf
    • https://cdn.shopify.com/s/files/1/0434/3519/6566/files/70331465411.pdf
    • https://cdn.shopify.com/s/files/1/0431/5398/1589/files/mujig.pdf
    • https://cdn.shopify.com/s/files/1/0432/5877/3662/files/mosafiviwukivu.pdf
    • https://cdn.shopify.com/s/files/1/0433/3882/5887/files/titiguxuwosovidederi.pdf
    • https://cdn.shopify.com/s/files/1/0433/9272/9246/files/16960806191.pdf
    • https://cdn.shopify.com/s/files/1/0431/3025/7568/files/4849957055.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/riwemabosemuridaredexe.pdf
    • https://cdn.shopify.com/s/files/1/0440/0267/2798/files/vufarotamunabese.pdf
    • https://cdn.shopify.com/s/files/1/0433/4852/5206/files/84266685500.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_off00006d00.bin
49128479cfe7d1ca00fcf2139a75da3936bc53e394288ce9e1ee19855cdc1336		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D00 5388 bytes
font_01_sfnt_off00007f53.bin
18e0bb8c40218f1698085860a57ca914ebc085ed9a7721b231277403cb2ecd77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F53 11036 bytes

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