Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdc65396d63b78a3…

MALICIOUS

PDF

47.3 KB Created: 2020-08-09 21:34:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: daad7430ba2ab33ddedbd7029483ee73 SHA-1: 1c6a2aea192b500911aaea548ba7262fa4321f2b SHA-256: bdc65396d63b78a3ef7f663098f5edf4131cf204b1a6fd15216a1fea7c764786
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with the primary link pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, while containing text related to accounting standards, is heavily obfuscated and likely serves as a lure to disguise the malicious links. The presence of numerous links hosted on platforms like Shopify suggests an attempt at SEO poisoning to drive traffic to malicious sites.

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=accounting+standard+9+revenue+recognition+pdf
    • http://files.wstfcure.org/uploads/1/3/2/6/132682171/ab03d.pdf
    • http://files.whiteroseartstudio.com/uploads/1/3/0/8/130813314/1195778.pdf
    • http://gawopimir.readingandspellingtutor.com/uploads/1/3/1/1/131164250/gozukorik.pdf
    • http://files.molebus.com/uploads/1/3/1/0/131070718/5903390.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gaxedisurerikemamezawapux.pdf
    • https://cdn.shopify.com/s/files/1/0438/4686/0957/files/linux_find_exec.pdf
    • https://cdn.shopify.com/s/files/1/0430/6976/7831/files/87688723649.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gegexovikorojirokelaxedu.pdf
    • https://cdn.shopify.com/s/files/1/0430/0472/3349/files/kijofipulub.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/19194700937.pdf
    • https://cdn.shopify.com/s/files/1/0434/0292/0086/files/tecnica_aromatouch_doterra.pdf
    • https://cdn.shopify.com/s/files/1/0437/7221/5448/files/13994483258.pdf
    • https://cdn.shopify.com/s/files/1/0429/6910/4540/files/4000_calorie_bulking_meal_plan.pdf
    • https://cdn.shopify.com/s/files/1/0433/7496/8986/files/analytical_chemistry_reference_books.pdf
    • https://cdn.shopify.com/s/files/1/0427/9202/6271/files/11048964789.pdf
    • https://cdn.shopify.com/s/files/1/0429/5032/8486/files/psd_to_mac.pdf
    • https://cdn.shopify.com/s/files/1/0431/4388/9052/files/46590228076.pdf
    • https://cdn.shopify.com/s/files/1/0435/0889/1807/files/27676911088.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_off000079cd.bin
4ebb7fe4af4aeeac1cb4d30748d31b61e6f07394cbfcf5dfbe1aecad61ee72bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79CD 5496 bytes
font_01_sfnt_off00008c99.bin
5a84f2170f7bd1d5ca136b59332f808270f54feacc44d394cbb4a7a40fe32454		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C99 10368 bytes

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