Malicious PDF — malware analysis report

Static analysis result for SHA-256 b598514b4cdcf8ff…

MALICIOUS

PDF

41.9 KB Created: 2020-08-21 07:01:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e3c4dce58c286a9695e9050cc867fa0 SHA-1: 6367121c4c303c868949b25f71727603da2532b1 SHA-256: b598514b4cdcf8ffa1707e7a6bc51244927b7e5a9aa855d14248c99c2e39b3b0
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector at 'ttraff.ru'. The document body, though partially corrupted, contains text referencing 'Candy crush hack apk for iphone', suggesting a lure to trick users into clicking the malicious link. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm further supports a malicious intent to drive traffic to potentially harmful 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=candy+crush+hack+apk+for+iphone
    • http://bufubi.peacelovemonkey.com/uploads/1/3/0/7/130739164/tijamafi.pdf
    • http://files.emilylubowklobucher.com/uploads/1/3/2/7/132740838/11f6702183651c.pdf
    • https://cdn.shopify.com/s/files/1/0431/9546/5892/files/japufigosukan.pdf
    • https://cdn.shopify.com/s/files/1/0429/3017/6159/files/75833967334.pdf
    • https://cdn.shopify.com/s/files/1/0431/0047/1456/files/11810470827.pdf
    • https://cdn.shopify.com/s/files/1/0429/0579/6774/files/wusikuxatugud.pdf
    • https://cdn.shopify.com/s/files/1/0430/8808/5143/files/22337053927.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65107231385.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/66048758492.pdf
    • https://cdn.shopify.com/s/files/1/0432/3006/8894/files/dutodivesew.pdf
    • https://cdn.shopify.com/s/files/1/0434/4076/7132/files/import_google_font_stylesheet.pdf
    • https://cdn.shopify.com/s/files/1/0428/6123/2294/files/chromosomal_disorders_download.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_off000059af.bin
e34c3c837ddeca2dae61ede1ebadd4b810d8d6de6c478b525d3b182547f62c28
pdf-font-stream PDF embedded font (sfnt) at offset 0x59AF 5280 bytes
font_01_sfnt_off00006b9e.bin
6c8c76666d6c188ba72bdd0e325f4a7e92bcea8ca004a390a0af26b628e490f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B9E 3036 bytes
font_02_sfnt_off0000781e.bin
cf5c7162e185a2da828492731e654b89f549edd5ffd2eba2b1c727d2cda0c0b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x781E 10120 bytes