Malicious PDF — malware analysis report

Static analysis result for SHA-256 5717743618eb554b…

MALICIOUS

PDF

51.3 KB Created: 2020-08-09 07:34:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebc1ee69c6c1e587c2405aa15ce4544b SHA-1: b7ab0fc3b8316dc82822f7b805049b3966351580 SHA-256: 5717743618eb554befefe796973a93f57b9477c86dfb84013dcb1eae0b466541
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one pointing to a known malicious redirector. The document body, though partially corrupted, includes text related to 'Aldi application pdf' and a URL that appears to be part of a link farm designed to attract traffic. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

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=aldi+application+pdf
    • http://kuduf.su649.org/uploads/1/3/1/6/131637814/4187890.pdf
    • http://files.redmosaicjewelry.com/uploads/1/3/2/6/132682899/3899513.pdf
    • http://files.seiklevabaks.com/uploads/1/3/0/7/130775727/3758726.pdf
    • http://files.ellisonjazzmuseum.org/uploads/1/3/1/4/131406741/vibibu-jobokipokuvo-movewerurilo-rigowumav.pdf
    • http://files.gitaarlesdamwoude.nl/uploads/1/3/0/7/130776500/vararuxijakunu-buradowitarosaf.pdf
    • https://cdn.shopify.com/s/files/1/0437/1329/8581/files/41132712630.pdf
    • https://cdn.shopify.com/s/files/1/0427/7341/4055/files/55998948323.pdf
    • https://cdn.shopify.com/s/files/1/0430/9218/1153/files/96398288629.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dijovosulodomozov.pdf
    • https://cdn.shopify.com/s/files/1/0433/5350/5946/files/vibinuxidudufajulo.pdf
    • https://cdn.shopify.com/s/files/1/0435/4162/7029/files/31820022457.pdf
    • https://cdn.shopify.com/s/files/1/0432/2348/2525/files/bible_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0432/8328/4136/files/zexared.pdf
    • https://cdn.shopify.com/s/files/1/0428/7938/5756/files/bubble_sort_python.pdf
    • https://cdn.shopify.com/s/files/1/0434/0203/5352/files/jelibezobezupumafefa.pdf
    • https://cdn.shopify.com/s/files/1/0431/3654/9018/files/manual_da_execuo_araken_de_assis_download.pdf
    • https://cdn.shopify.com/s/files/1/0427/9622/0572/files/koxabubaxu.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_off00008b68.bin
536cacd5179064105806016fb4aea8295d0071ea980089cda254f14869af26c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x8B68 4864 bytes
font_01_sfnt_off00009c10.bin
cd22822dd2a72aa2128ead113cbc4723aa690a4dff1d183815a3a46da724bf41
pdf-font-stream PDF embedded font (sfnt) at offset 0x9C10 10580 bytes