Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a8871304aeee72c…

MALICIOUS

PDF

41.0 KB Created: 2020-08-05 03:54:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7aee8e24dca6dcc057c572b26431c95 SHA-1: 77d60fcd5e0dd2a5ff248dba906213e7ae036d91 SHA-256: 9a8871304aeee72c8f8d23b1f48b8454e9a16a7f548aaa5ee7065f556bc88a13
152 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com. One of the primary links, https://ttraff.ru/pify?keyword=subway+map+montreal+pdf, is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to these URLs, suggesting the primary purpose is to lure users to malicious sites through a deceptive 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.ru/pify?keyword=subway+map+montreal+pdf
    • http://files.chenyy0527.com/uploads/1/3/2/6/132696249/8000736.pdf
    • http://files.rockphenoms.com/uploads/1/3/2/8/132815785/6dc05f.pdf
    • http://files.geersrobotics.com/uploads/1/3/0/9/130968993/safavozepowesu_piratapo.pdf
    • https://cdn.shopify.com/s/files/1/0434/7750/0057/files/13037709270.pdf
    • https://cdn.shopify.com/s/files/1/0430/7111/1330/files/74940861514.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xibirinadinabamagumib.pdf
    • https://cdn.shopify.com/s/files/1/0429/1729/8329/files/ffxiv_buying_a_house.pdf
    • https://cdn.shopify.com/s/files/1/0430/4306/1913/files/fuwumimebakosubedoxako.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/52299098946.pdf
    • https://cdn.shopify.com/s/files/1/0431/0440/3613/files/bisedopuriduwodubijixa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/9204741539.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51108684678.pdf
    • https://cdn.shopify.com/s/files/1/0437/8080/0674/files/93116948495.pdf
    • https://cdn.shopify.com/s/files/1/0432/1656/8482/files/diviloguzoxisojasusire.pdf
    • https://cdn.shopify.com/s/files/1/0437/4387/1128/files/19159775405.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_off000062a3.bin
9216cbedec6813667e1d33763dbc9254243fd7617e7f38f7c00c996aa0204e98
pdf-font-stream PDF embedded font (sfnt) at offset 0x62A3 5448 bytes
font_01_sfnt_off00007527.bin
3f02c720c5cbf01ce2ce51d1f3e3593a407b23d9103da34bdd1e8bf430f53611
pdf-font-stream PDF embedded font (sfnt) at offset 0x7527 9992 bytes