Malicious PDF — malware analysis report

Static analysis result for SHA-256 a10be7a2d905cd25…

MALICIOUS

PDF

43.9 KB Created: 2020-08-28 11:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b216b0444993780f73576ac86313179 SHA-1: d7fe8448f71db91a7f822746dbe473fadb5db3de SHA-256: a10be7a2d905cd25c0c7f2f8381d6e671ec4db188bcd482a3a341a39bdf4bf19
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to the presence of a link farm and a redirector link pointing to known malicious infrastructure. The embedded URL leads to 'https://ttraff.com/pify?keyword=keystone+motel+steven+universe', which is a critical indicator of malicious intent. The document body contains garbled text but includes the same malicious URL, reinforcing the finding.

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=keystone+motel+steven+universe
    • http://files.hoopspulse.com/uploads/1/3/1/3/131378950/1003228.pdf
    • https://cdn.shopify.com/s/files/1/0429/5750/4668/files/synthesis_of_2-_iodobenzoic_acid_lab_report.pdf
    • https://cdn.shopify.com/s/files/1/0436/4910/6080/files/66201589306.pdf
    • https://cdn.shopify.com/s/files/1/0431/3242/0264/files/tax_administration_act_1953.pdf
    • https://cdn.shopify.com/s/files/1/0434/3165/7638/files/asvab_paragraph_comprehension_test.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zafon.pdf
    • https://cdn.shopify.com/s/files/1/0428/1335/8247/files/chairman_s_report_for_agm.pdf
    • https://cdn.shopify.com/s/files/1/0431/9805/4558/files/intermediate_english_story_book.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4889/files/facebook_apk_file_old_version.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_off0000708e.bin
d2bb4c5de766f72cfdc68ddfff2e5c438d4d471483b70096b198da79846f98d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x708E 4752 bytes
font_01_sfnt_off000080b1.bin
198524279113c68334f4fef686fd19751bf99a4e816733b74bf63bdec965e1da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80B1 10016 bytes

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