Malicious PDF — malware analysis report

Static analysis result for SHA-256 877ebe4d35554dd6…

MALICIOUS

PDF

54.5 KB Created: 2020-08-06 05:13:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d70cf260c771b605b271a07ed2e16bb SHA-1: cadd3c45d54b5432030bf378f93ee7029f0b4f1d SHA-256: 877ebe4d35554dd6051191d95010e1f9eb32e88dfeab92154ddbf7f02398efc2
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. This URL is presented in the document body, disguised as a link to a PDF about 'tranexamic acid mechanism of action'. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be social engineering via a deceptive document title and malicious 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.ru/pify?keyword=tranexamic+acid+mechanism+of+action+pdf
    • http://files.cvwdi.org/uploads/1/3/1/1/131163833/kajidalafim.pdf
    • http://files.villajadisottomarinaapartments.com/uploads/1/3/2/7/132712000/nevifubufokumum.pdf
    • http://files.songwritingcharity.org/uploads/1/3/2/3/132303172/09bb970.pdf
    • http://files.naturallydoulasd.com/uploads/1/3/1/0/131070452/dasazasaraz.pdf
    • https://cdn.shopify.com/s/files/1/0434/4601/0022/files/89558959455.pdf
    • https://cdn.shopify.com/s/files/1/0434/0262/5178/files/sunepusidubonu.pdf
    • https://cdn.shopify.com/s/files/1/0435/3196/0474/files/apsc_syllabus_2020.pdf
    • https://cdn.shopify.com/s/files/1/0448/1178/0257/files/allotropes_of_elements.pdf
    • https://cdn.shopify.com/s/files/1/0433/8620/8406/files/ragowagasulexedave.pdf
    • https://cdn.shopify.com/s/files/1/0431/9382/7485/files/var_candrive_age_16_yes__no.pdf
    • https://cdn.shopify.com/s/files/1/0431/0512/4516/files/suzotewudopuremujemu.pdf
    • https://cdn.shopify.com/s/files/1/0434/4302/8120/files/visumegomumokavuxufa.pdf
    • https://cdn.shopify.com/s/files/1/0430/9732/5732/files/memobojuzipibobekiloduva.pdf
    • https://cdn.shopify.com/s/files/1/0431/2337/6277/files/kirunepumevoganowapim.pdf
    • https://cdn.shopify.com/s/files/1/0433/8342/3128/files/61624582525.pdf
    • https://cdn.shopify.com/s/files/1/0433/4754/2175/files/fumakafafemanibiju.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008944.bin
7120615a6e5d49bf40b48888ebe7de12cbd395d981fd0c81c579eb55d376f57a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8944 5168 bytes
font_01_sfnt_off00009aa1.bin
73c48a5a0ba477768f6cd8d7d9c4fd7c2a123963d45a8727f842b3409fa7a911		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AA1 10572 bytes
font_02_sfnt_off0000beb5.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBEB5 4324 bytes

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