Malicious PDF — malware analysis report

Static analysis result for SHA-256 af8999beceb7ba1d…

MALICIOUS

PDF

118.9 KB Created: 2020-08-09 09:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd3fb150bc43a3f8facae175949d4e6c SHA-1: 5a587477508b9cac64a93bc4dbd8b2a4089e22ad SHA-256: af8999beceb7ba1da2d7dcc79a7e74a7ab658bc92d52618056be9d57e6b68b75
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains embedded links that point to a redirector URL, which is a common technique for phishing and malware distribution. The ML classifier strongly indicated maliciousness. The document body text, though heavily obfuscated, contains the URL that is likely presented to the user as a lure.

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=advanced+awk+programming+pdf
    • http://midujoxi.randysnfldcountrymusic.com/uploads/1/3/2/6/132681670/gedalusuvo.pdf
    • http://files.viv-w.com/uploads/1/3/0/9/130969260/fifedirokabofu.pdf
    • http://files.kinesiologie74.fr/uploads/1/3/2/7/132740384/xugezo.pdf
    • http://files.dicastables.com/uploads/1/3/2/7/132712235/videnexaw-rivanokuvobed-bubokusibinuwo-xinefojulaxedo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0820/4701/files/83147244364.pdf
    • https://cdn.shopify.com/s/files/1/0433/5170/3706/files/4811408885.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/76423385748.pdf
    • https://cdn.shopify.com/s/files/1/0430/9054/2743/files/boseluwuxomomerizugem.pdf
    • https://cdn.shopify.com/s/files/1/0431/5630/8123/files/algebraic_expressions_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0437/5802/6904/files/93656720039.pdf
    • https://cdn.shopify.com/s/files/1/0432/7289/6672/files/37080612141.pdf
    • https://cdn.shopify.com/s/files/1/0429/5426/0643/files/5488678213.pdf
    • https://cdn.shopify.com/s/files/1/0428/7247/1718/files/brute_lawn_mower.pdf
    • https://cdn.shopify.com/s/files/1/0447/4611/3173/files/wedding_itinerary_template.pdf
    • https://cdn.shopify.com/s/files/1/0434/0701/6103/files/43199283697.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_off0001888d.bin
5d1972979ed6cb9dad90ff17ce6f9dd0e5eb33475ebcbbe0ac7718f55f480e69
pdf-font-stream PDF embedded font (sfnt) at offset 0x1888D 5468 bytes
font_01_sfnt_off00019b33.bin
9b41b60f1b9972cfb36697d66154450b9263fd04c07d60ec3836a6d93be7fbc5
pdf-font-stream PDF embedded font (sfnt) at offset 0x19B33 16196 bytes