Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c9c6ef8e309e1ca…

MALICIOUS

PDF

35.1 KB Created: 2020-09-17 12:33:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31522a669909e0c298e2f6cda6d285d1 SHA-1: 0d7c581185adc07a7489ba796781f19f717ce0c5 SHA-256: 8c9c6ef8e309e1ca12f3621d7b5c85507b2c2cf58bf1f1a4effd623c31bddd7b
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to a URL that appears to be a lure for downloading an APK. Additionally, the file exhibits characteristics of a link farm, with numerous embedded URLs, some of which are also PDFs. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL and other PDF links.

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.me/wix?keyword=hey+monster+apk+download+apkreal
    • https://ad560392-fcdd-4cae-af3a-b5e1ae3cbcb4.filesusr.com/ugd/66f3f9_0aca77a1b3e34ea3aa502dfa0c1b46fe.pdf?index=true
    • https://df375eb3-26dc-4aae-b6fe-066011155129.filesusr.com/ugd/b85eb0_67d682d9da0f46cda075de250e91b55e.pdf?index=true
    • https://9d42f0c8-b71a-479c-af27-fe09d7f832a3.filesusr.com/ugd/e42c35_e3dffeaf01b14ec18d4bf847fc2167da.pdf?index=true
    • https://fed33d05-5147-4948-8c30-bc1b20042f53.filesusr.com/ugd/590778_35daa8163e264fb9a816cc5540879f4e.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0431/1633/1172/files/cours_informatique_excel_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/2705/4237/files/32304343450.pdf
    • https://cdn.shopify.com/s/files/1/0440/7135/4533/files/thin_air_amelie_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0431/4346/3074/files/nairabet_com_app.pdf
    • https://cdn.shopify.com/s/files/1/0429/6353/3977/files/alkaline_diet_for_dummies.pdf
    • https://cdn.shopify.com/s/files/1/0427/8976/5279/files/47369710194.pdf
    • https://cdn.shopify.com/s/files/1/0437/9148/3041/files/74490739885.pdf
    • https://cdn.shopify.com/s/files/1/0430/2657/9610/files/warehouse_keeper_job_description.pdf
    • https://cdn.shopify.com/s/files/1/0439/1036/5339/files/nobijagekaze.pdf
    • https://cdn.shopify.com/s/files/1/0434/5738/0514/files/bud_trimmer_jobs_california.pdf
    • https://cdn.shopify.com/s/files/1/0452/3789/5325/files/cover_letter_for_engineering_jobs_fresh_graduate.pdf
    • https://cdn.shopify.com/s/files/1/0429/7113/6154/files/leloneliropakozekuboveji.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_off00004d38.bin
fa249dadb6674a5ed35bbe1b9fde4c8f1f76cba05b506311d0c2405261f230cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D38 5324 bytes
font_01_sfnt_off00005f4e.bin
fb178b70ffc59b55ee02931c0d143ed77905dfbd7622ab58e2277f34ff7d5a12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F4E 9528 bytes

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