Malicious PDF — malware analysis report

Static analysis result for SHA-256 da6322c6e0ba48a8…

MALICIOUS

PDF

49.6 KB Created: 2020-07-31 05:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa4e8a9a1eb062ef7e95c263083c1a5b SHA-1: 35f7e03afef3c99f3f6030b10f880a2913c16d46 SHA-256: da6322c6e0ba48a8373258806d8421b12950c75265e605c4f8aa0a332ec6f44c
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=pdf+advertising+media'. Additionally, it exhibits a PDF link farm behavior, embedding 18 external links, many hosted on Shopify. The ML classifier also strongly flagged this PDF as malicious. The document body is heavily obfuscated, preventing a clear understanding of its direct user-facing content, but the link farm and redirector strongly suggest a malicious intent to lure users to external, potentially harmful, content.

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=pdf+advertising+media
    • http://files.midatlanticmotionpictures.com/uploads/1/3/0/8/130813558/mozuva.pdf
    • http://files.aceamsea.org/uploads/1/3/1/4/131438680/niwupovagosuzetisazo.pdf
    • http://files.jenniferbundy.com/uploads/1/3/1/4/131454012/joxiralefa_nedoretofob_jexixovidexawos_widokaxigaw.pdf
    • http://files.bighammershields.com/uploads/1/3/1/3/131379594/punepotegi.pdf
    • https://cdn.shopify.com/s/files/1/0429/9679/3503/files/xexulesupolade.pdf
    • https://cdn.shopify.com/s/files/1/0428/3020/0991/files/99344345949.pdf
    • https://cdn.shopify.com/s/files/1/0432/0880/2468/files/74160135185.pdf
    • https://cdn.shopify.com/s/files/1/0432/1378/3199/files/puxatexodemufarima.pdf
    • https://cdn.shopify.com/s/files/1/0432/7460/0598/files/51710390345.pdf
    • https://cdn.shopify.com/s/files/1/0430/4168/5665/files/jurobeferilemedubejer.pdf
    • https://cdn.shopify.com/s/files/1/0432/3147/7922/files/tuzej.pdf
    • https://cdn.shopify.com/s/files/1/0433/1329/9620/files/guravawogopudided.pdf
    • https://cdn.shopify.com/s/files/1/0432/3019/9966/files/3934628844.pdf
    • https://cdn.shopify.com/s/files/1/0430/7818/9205/files/pivadadapi.pdf
    • https://cdn.shopify.com/s/files/1/0428/5464/5916/files/8010828993.pdf
    • https://cdn.shopify.com/s/files/1/0440/5864/0534/files/vejojolo.pdf
    • https://cdn.shopify.com/s/files/1/0433/6310/6968/files/lovusoliwetalemilalarur.pdf
    • https://cdn.shopify.com/s/files/1/0432/2761/1295/files/ziwivulorimukulota.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_off0000843e.bin
4a5d7cc9a2bd0a483cbe0570605b5301993585e8e4872dd023a710ba93f8adef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x843E 4932 bytes
font_01_sfnt_off000094ea.bin
11862805baca4cbdf0a6690ad8c2cd31c15b76582174a48384670c8790d30db2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94EA 10764 bytes

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