Malicious PDF — malware analysis report

Static analysis result for SHA-256 be33c18b6a70ce56…

MALICIOUS

PDF

49.8 KB Created: 2020-08-04 05:19:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b8d9ea58633346c5ce47168b0f8f5f4 SHA-1: f96485d6ef862613d0145fd0172388e00dddcb36 SHA-256: be33c18b6a70ce5653318c60b9434519382925a2022b4f62b2adee5d4fe7e0a2
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious infrastructure, indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the URL and text suggesting a lure for 'Apprendre le japonais pour les nuls pdf'. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be social engineering via a deceptive link.

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=apprendre+le+japonais+pour+les+nuls+pdf
    • http://files.ohiocensus.org/uploads/1/3/2/6/132682076/6433606.pdf
    • http://files.confluencelawcenter.com/uploads/1/3/2/3/132303019/6974370.pdf
    • http://files.holytrinityri.com/uploads/1/3/1/4/131453684/toroka.pdf
    • http://files.ddsbeautysupply.com/uploads/1/3/1/0/131070393/gujezugupitava.pdf
    • https://cdn.shopify.com/s/files/1/0431/3694/2234/files/billie_jean_bpm.pdf
    • https://cdn.shopify.com/s/files/1/0429/5363/8044/files/lanafugagivetuveti.pdf
    • https://cdn.shopify.com/s/files/1/0430/0413/3525/files/xiwezexirininotuwonel.pdf
    • https://cdn.shopify.com/s/files/1/0435/5732/2903/files/serway_vuille_college_physics_9th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0433/9413/8277/files/64989357489.pdf
    • https://cdn.shopify.com/s/files/1/0432/9196/7652/files/51313897488.pdf
    • https://cdn.shopify.com/s/files/1/0428/4828/8934/files/2727292125.pdf
    • https://cdn.shopify.com/s/files/1/0437/9171/2405/files/dazuwisemizalowokamegaja.pdf
    • https://cdn.shopify.com/s/files/1/0435/3723/6119/files/fujovisozaxifigolo.pdf
    • https://cdn.shopify.com/s/files/1/0440/9622/5432/files/tailoring_leveling_guide_vanilla.pdf
    • https://cdn.shopify.com/s/files/1/0440/6162/2437/files/on_the_road_again_chords.pdf
    • https://cdn.shopify.com/s/files/1/0432/9730/8840/files/somesit.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_off00008122.bin
ee2e38ddb44590b8bbf761c66aff534cded585faa0768ded3f3129ea232e3574
pdf-font-stream PDF embedded font (sfnt) at offset 0x8122 5100 bytes
font_01_sfnt_off0000928f.bin
159e42a2eb9d47d1933bf39a38269d54da7b5ab26ac143a6afc6468427dc730d
pdf-font-stream PDF embedded font (sfnt) at offset 0x928F 12156 bytes