Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2c4103740f11e14…

MALICIOUS

PDF

43.3 KB Created: 2020-08-25 18:04:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c911b4cf8723c3b8215314826321678f SHA-1: ff21da59950507f41c99543a7db640481d20cc3f SHA-256: e2c4103740f11e14af900171a23d4658bbc748e57f9dd70884eace87aae438d2
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the text 'Performance appraisal sentence examples' and the malicious URL, suggesting a lure to trick users into clicking the link. The presence of a link farm further supports the malicious intent of distributing links to potentially harmful content.

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=performance+appraisal+sentence+examples
    • http://xusasoka.clearcreekchoir.com/uploads/1/3/1/6/131637136/wuzakuxodisobu.pdf
    • http://files.franksflybox.com/uploads/1/3/2/8/132814791/1fd6ae925f.pdf
    • http://ziwuba.reflectionsmichiana.com/uploads/1/3/0/7/130738850/2271221.pdf
    • http://rezajele.missionbendchurch.org/uploads/1/3/1/6/131606289/turumi-pirosijixoma-xipalixutatujo.pdf
    • http://files.vibrant-energies.com/uploads/1/3/0/8/130873907/nomadu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0895/8362/files/80795881400.pdf
    • https://cdn.shopify.com/s/files/1/0431/4578/9606/files/bollywood_movies_list_2015_free_hd.pdf
    • https://cdn.shopify.com/s/files/1/0433/3787/5614/files/ecfmg_epic_report.pdf
    • https://cdn.shopify.com/s/files/1/0462/7683/7536/files/tagezulokeweziretudopufe.pdf
    • https://cdn.shopify.com/s/files/1/0431/8524/2269/files/muralexeboxirijuga.pdf
    • https://cdn.shopify.com/s/files/1/0435/0266/5892/files/50310487.pdf
    • https://cdn.shopify.com/s/files/1/0430/0436/2906/files/6625689033.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/70945418412.pdf
    • https://cdn.shopify.com/s/files/1/0432/3190/3902/files/13969448790.pdf
    • https://cdn.shopify.com/s/files/1/0432/3688/4642/files/100_opposite_words_in_kannada_language.pdf
    • https://cdn.shopify.com/s/files/1/0428/2440/1063/files/51570791482.pdf
    • https://cdn.shopify.com/s/files/1/0435/2134/3647/files/kagetubitefumefijezovaxu.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_off00006c67.bin
41879428c7d3ea5372714279a31869ce226d6f8e4d314a793269dff871a02c12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C67 5228 bytes
font_01_sfnt_off00007e16.bin
bc585977a7b8a367ad3dc59ec2beb9a10a9976c7cfdb3183c5263f35422b1431		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E16 9964 bytes

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