Malicious PDF — malware analysis report

Static analysis result for SHA-256 01b1823b54e9e400…

MALICIOUS

PDF

33.9 KB Created: 2020-08-18 23:38:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c41ec80859bc327c498948edb4c6c623 SHA-1: 8fbe771deffe6befd9befa05ea31178acc6eccd3 SHA-256: 01b1823b54e9e400ce51a3c0e410e3c56392ad3630b37007192d2b73a4601b86
162 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many of which point to link farms hosted on Shopify. One prominent link, 'https://ttraff.ru/pify?keyword=reported+speech+exercise+online', is identified as a malicious redirector. The presence of a 'download button' heuristic further suggests a lure to trick users into clicking these malicious links. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=reported+speech+exercise+online
    • http://naron.trinitahill.com/uploads/1/3/0/7/130775768/xokobogifurimetifos.pdf
    • http://bukaso.raciallyjustutah.org/uploads/1/3/0/8/130874359/momutik.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8851/9080/files/juxikijidodujatusiredonen.pdf
    • https://cdn.shopify.com/s/files/1/0432/5038/5051/files/sujufubijibapemudezozax.pdf
    • https://cdn.shopify.com/s/files/1/0433/9898/7926/files/toviwafidowaleputijovap.pdf
    • https://cdn.shopify.com/s/files/1/0428/6034/7551/files/kikewexomemaleriwagidafux.pdf
    • https://cdn.shopify.com/s/files/1/0436/3298/4222/files/1998_ford_mustang_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/5329/2440/files/big_data_analytics_jntu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/kinobody_superhero_bulking_program_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/2897/1681/files/47416359733.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004761.bin
37403f8bb618e012ae66b82d0626505cc2f982dc59208960c8598846547bb45e
pdf-font-stream PDF embedded font (sfnt) at offset 0x4761 5028 bytes
font_01_sfnt_off0000587d.bin
6352609d243f98d598dbcdace62f62d7935466c2f912168fd03612d5965aeabb
pdf-font-stream PDF embedded font (sfnt) at offset 0x587D 10092 bytes