Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4c81b007d9ee7c1…

MALICIOUS

PDF

55.3 KB Created: 2020-08-20 05:26:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 242d24f901051bdeaf5f8267a1f7f5cb SHA-1: b9fceef8da303141006672f08573329140b50b67 SHA-256: b4c81b007d9ee7c12b55a8b9dfe7b5ff8de9dfb36a8c5eb9f3778bb56df37aed
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=iata+airport+codes+list', suggesting a lure to a malicious site disguised as a resource for airport codes. The ML classifier strongly indicated maliciousness, supporting the presence of malicious redirector links.

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=iata+airport+codes+list
    • http://files.populationservices.org/uploads/1/3/0/9/130970012/fdb59.pdf
    • http://lukopeto.foodfightdenver.com/uploads/1/3/1/3/131383965/4dcf4a10ad3a.pdf
    • http://files.culinaryvacationsinc.com/uploads/1/3/1/3/131379699/1989253.pdf
    • http://puxuzi.suburbanhennepinhousingcoalition.com/uploads/1/3/1/8/131871390/8d033dd16b.pdf
    • https://cdn.shopify.com/s/files/1/0431/7141/4167/files/apa_citation_generator_for_online.pdf
    • https://cdn.shopify.com/s/files/1/0430/6426/2818/files/bodopalelobubedas.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/17612659915.pdf
    • https://cdn.shopify.com/s/files/1/0429/6769/5509/files/sonun.pdf
    • https://cdn.shopify.com/s/files/1/0440/0345/9230/files/what_up_answer_you.pdf
    • https://cdn.shopify.com/s/files/1/0440/6686/5302/files/focus_group_guide_example.pdf
    • https://cdn.shopify.com/s/files/1/0431/6856/3351/files/12439975590.pdf
    • https://cdn.shopify.com/s/files/1/0438/8945/9368/files/5845357034.pdf
    • https://cdn.shopify.com/s/files/1/0430/4617/4877/files/congratulations_card_template_printable.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_off00009056.bin
4a34523d34047ef8baaffffd356d868354ad6cb1938955b56f6bc9bb65167938
pdf-font-stream PDF embedded font (sfnt) at offset 0x9056 5004 bytes
font_01_sfnt_off0000a155.bin
89203ff116f05036b63fba09b9dc372c21e820a884f9afa0df288a7b055d536c
pdf-font-stream PDF embedded font (sfnt) at offset 0xA155 15092 bytes