Malicious PDF — malware analysis report

Static analysis result for SHA-256 88c332bd868e050c…

MALICIOUS

PDF

57.2 KB Created: 2020-08-19 04:26:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ded8e4c09b5077eec133079b4767fba SHA-1: 25689e6acd0bd2a7db15ff76869a1e96e6bbfdeb SHA-256: 88c332bd868e050c9f89f1aacf59837b481dc49446622e23d7e191f6a9a363d0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains, including a known malicious redirector. The primary malicious link, 'https://ttraff.com/pify?keyword=hablar+yo+form+conjugation', is flagged as malicious. This suggests the document is designed to direct users to potentially harmful content through a link farm, likely for SEO poisoning or phishing purposes.

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.com/pify?keyword=hablar+yo+form+conjugation
    • http://tuvifana.kozal.net/uploads/1/3/1/1/131164250/kumiselevepesod.pdf
    • http://files.francescaarnone.com/uploads/1/3/1/3/131378993/jurujonexu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/6896/4505/files/78983940368.pdf
    • https://cdn.shopify.com/s/files/1/0433/2843/8427/files/webogabesonedabigol.pdf
    • https://cdn.shopify.com/s/files/1/0436/7787/6377/files/regodatofafoguno.pdf
    • https://cdn.shopify.com/s/files/1/0438/7468/0987/files/94567796726.pdf
    • https://cdn.shopify.com/s/files/1/0428/9629/4051/files/25710103984.pdf
    • https://cdn.shopify.com/s/files/1/0438/4777/8469/files/berlin_lonely_planet.pdf
    • https://cdn.shopify.com/s/files/1/0434/3565/5335/files/crowds_and_power_elias_canetti_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0430/3015/1330/files/rexefurodozexeni.pdf
    • https://cdn.shopify.com/s/files/1/0431/7731/2405/files/aerobic_vs_anaerobic_wastewater_treatment.pdf
    • https://cdn.shopify.com/s/files/1/0431/9110/7752/files/xofujiweseximejeror.pdf
    • https://cdn.shopify.com/s/files/1/0454/7146/5624/files/finance_budget_2020_highlights.pdf
    • https://cdn.shopify.com/s/files/1/0431/6571/2535/files/cosmetology_study_guide.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000bc53.bin
7274ea543b155373233cfb23895ca343a5c70d4723552a4731fb4a9b6a5dac7e		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xBC53 17848 bytes
font_00_sfnt_off000074fe.bin
c753f9c218d3d33027e24565053200cd03b4ce9ea9b9e1e93f3ff8577029b9c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74FE 3908 bytes
font_01_sfnt_off000082cc.bin
4097ae427af1c4298ed309ad4f10f8d2b2fa97df4c36488549f7d6835095639d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82CC 5304 bytes
font_02_sfnt_off000094ca.bin
b642797ec1dfb5e27c9f7627b0771e52b7f1a7e7b0d3c9ff73edbddc6dbc6168		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94CA 13024 bytes

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