Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4e9831258d9d495…

MALICIOUS

PDF

44.9 KB Created: 2020-08-24 12:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa211908d642eeca20be1bcbf86f8d33 SHA-1: 7de1347e05ca60900475d44ba638847c4c65be01 SHA-256: f4e9831258d9d4958d8d90244c70f6311e5aeec091d664ea335c23c3852b6601
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, which is indicative of a link farm. One of the primary links, 'https://ttraff.cc/pify?keyword=wow+classic+druid+quests+guide', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains text related to 'wow classic druid quests guide' which appears to be a lure to disguise the malicious link farm.

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=wow+classic+druid+quests+guide
    • http://memabo.nebraskarainbowgirls.com/uploads/1/3/2/8/132816202/b36c45f62e127.pdf
    • http://balel.carlyturro.com/uploads/1/3/1/0/131069766/08e958ff81106c.pdf
    • https://cdn.shopify.com/s/files/1/0432/3776/9383/files/14976681059.pdf
    • https://cdn.shopify.com/s/files/1/0435/3844/8548/files/xasisefupev.pdf
    • https://cdn.shopify.com/s/files/1/0430/4519/1841/files/36513824582.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mojedisubeweful.pdf
    • https://cdn.shopify.com/s/files/1/0439/2573/3531/files/nuroriwikaperi.pdf
    • https://cdn.shopify.com/s/files/1/0432/9019/8180/files/95495754310.pdf
    • https://cdn.shopify.com/s/files/1/0449/8073/2062/files/nosaviv.pdf
    • https://cdn.shopify.com/s/files/1/0428/7492/9319/files/wordscapes_answers_1042.pdf
    • https://cdn.shopify.com/s/files/1/0437/1313/4757/files/oxford_dictionary_word_of_the_year_2020.pdf
    • https://cdn.shopify.com/s/files/1/0434/7258/4861/files/50022828229.pdf
    • https://cdn.shopify.com/s/files/1/0434/8860/8418/files/33431174747.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_off000072a5.bin
e44e7408c78668a8689620bd0bafeb979bc67876feff110be7df2f4926dfb0f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x72A5 5336 bytes
font_01_sfnt_off000084e0.bin
44350972eaf15c17d0086809b123f71f458cbf6e8246063140f666dffd0806d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x84E0 9980 bytes