Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8a227f3503d6019…

MALICIOUS

PDF

39.7 KB Created: 2020-08-21 20:08:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19b7bf5af7a31c01648417f3f9c1e17b SHA-1: b0a8b7716bb313cd91e63702cb3d2f81e2835b89 SHA-256: e8a227f3503d601915ba1bca984f2ebb38f50a6bf1e1c2fd3cbb7ee307883583
152 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=android+bitmap+to+rgba+byte+array', which is likely used to redirect the user to malicious content. The presence of numerous Shopify-hosted PDF links suggests a link farm or SEO manipulation tactic.

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.cc/pify?keyword=android+bitmap+to+rgba+byte+array
    • http://files.collarclub.co.uk/uploads/1/3/1/4/131437699/e5ebfbee100.pdf
    • http://files.mycannablissonline.com/uploads/1/3/1/3/131382018/lurelu-wepepot.pdf
    • http://files.kodiakberean.com/uploads/1/3/1/4/131454503/2672503.pdf
    • https://cdn.shopify.com/s/files/1/0451/0469/3400/files/sosuwadejuberazosemuj.pdf
    • https://cdn.shopify.com/s/files/1/0438/3807/9138/files/35063734864.pdf
    • https://cdn.shopify.com/s/files/1/0435/2599/6698/files/tojelugokusefewifat.pdf
    • https://cdn.shopify.com/s/files/1/0429/7854/1722/files/zelelubakiwagokunuwude.pdf
    • https://cdn.shopify.com/s/files/1/0428/5290/9212/files/rockland_journal_news_police_blotter.pdf
    • https://cdn.shopify.com/s/files/1/0437/4347/7909/files/french_to_english_words.pdf
    • https://cdn.shopify.com/s/files/1/0434/6213/1869/files/tugowe.pdf
    • https://cdn.shopify.com/s/files/1/0432/5530/0249/files/bankruptcy_act_1966.pdf
    • https://cdn.shopify.com/s/files/1/0433/7028/3173/files/my_friend_flicka_book.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_off00005dde.bin
eb340508dd58f0681570f3e1337760173df1c30d9d4563cb0e49bedc4ec801ce
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DDE 5300 bytes
font_01_sfnt_off00006fc8.bin
9ee82dc4a83bcd7ba27d4c94fc22d0471553c05c994d709df81004fda466c96d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FC8 10084 bytes