Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a89a9fdf5db2c59…

MALICIOUS

PDF

43.2 KB Created: 2020-08-19 20:43:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0831c656b6094a776c9818e0656d487 SHA-1: 4bee3768b2927876281fd06a54e232b820d85f77 SHA-256: 1a89a9fdf5db2c590cbd7acaa2c6b7fc5020f1717c158b639774be889c52ac99
152 Risk Score

Malware Insights

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

The PDF document contains a deceptive title 'Leave application form for school students' to trick users into clicking on a malicious link. This link, 'https://ttraff.cc/pify?keyword=leave+application+form+for+school+students', redirects to a link farm, indicating a phishing or redirection attack. The presence of numerous external PDF links, many pointing to benign Shopify domains but some to unknown domains, further supports the link farm heuristic. The ML classifier also strongly flagged this PDF as malicious.

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=leave+application+form+for+school+students
    • http://kigaxato.buckscountypainters.com/uploads/1/3/0/7/130776487/mokepodapalune.pdf
    • http://sinabaw.livingstonemasons.com/uploads/1/3/1/8/131856772/fabekogaribokunup.pdf
    • http://files.leilahmoondances.com/uploads/1/3/1/3/131398097/tufafenimo_ganux.pdf
    • http://files.craftyladycrushingcancer.com/uploads/1/3/1/6/131607712/xuworibu-bibisogimiwuki-jujezozepaza.pdf
    • https://cdn.shopify.com/s/files/1/0437/9456/3229/files/stepper_motor_datasheet.pdf
    • https://cdn.shopify.com/s/files/1/0435/8235/7663/files/pepidar.pdf
    • https://cdn.shopify.com/s/files/1/0440/3032/8997/files/48974461369.pdf
    • https://cdn.shopify.com/s/files/1/0432/4953/3088/files/44133033205.pdf
    • https://cdn.shopify.com/s/files/1/0435/0260/0356/files/36491839047.pdf
    • https://cdn.shopify.com/s/files/1/0428/9839/1196/files/55270289865.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/birizakidunupujudexi.pdf
    • https://cdn.shopify.com/s/files/1/0434/4945/0661/files/oracle_sql_interview_questions_and_answers_for_experienced.pdf
    • https://cdn.shopify.com/s/files/1/0436/1384/7710/files/cppunit_report_example.pdf
    • https://cdn.shopify.com/s/files/1/0431/7986/8320/files/kelav.pdf
    • https://cdn.shopify.com/s/files/1/0433/1572/4443/files/42528968153.pdf
    • https://cdn.shopify.com/s/files/1/0431/0430/5303/files/american_revolution_battles_activity.pdf
    • https://cdn.shopify.com/s/files/1/0434/8080/9622/files/84044911628.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_off00006bb9.bin
8f6ec1b39922764f1d7c05c689dbe3b2dc841989b78a9dc5b3a5c6df77ebe1e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BB9 5396 bytes
font_01_sfnt_off00007dee.bin
6ab941baa247911cab7943aa932c224d2714123906f21368ca07481674227588		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DEE 9972 bytes

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