Malicious PDF — malware analysis report

Static analysis result for SHA-256 87b4b1fa6f91d150…

MALICIOUS

PDF

43.4 KB Created: 2020-08-21 00:40:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 208d4a212d755580f687c6be36d2a829 SHA-1: dcb67910fa698a4b6bb9530eccd6bebc77291b93 SHA-256: 87b4b1fa6f91d150cfb17de3cc93ee4cba2690377b69fd179e9c2fe048a035f0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF document was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The primary malicious URL, https://ttraff.com/pify?keyword=wedding+invitation+cards+templates+word, is likely used to lure victims with a seemingly relevant search term. The document body, though heavily obfuscated, contains references to this URL and appears to be generated by wkhtmltopdf, a tool often abused for creating malicious PDFs.

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.com/pify?keyword=wedding+invitation+cards+templates+word
    • http://xukut.alphaeta42.com/uploads/1/3/1/6/131606349/3463050.pdf
    • http://files.tarpanmanagers.com/uploads/1/3/0/8/130874124/4176531.pdf
    • http://zibexo.diamondcutglass.com/uploads/1/3/1/4/131406970/tasigijikowexax.pdf
    • https://cdn.shopify.com/s/files/1/0437/0631/9001/files/fiweronufox.pdf
    • https://cdn.shopify.com/s/files/1/0438/2579/1133/files/penatalaksanaan_asma_pada_anak.pdf
    • https://cdn.shopify.com/s/files/1/0437/1379/0106/files/update_anomalies_in_dbms.pdf
    • https://cdn.shopify.com/s/files/1/0429/3482/9223/files/disable_background_sync_android.pdf
    • https://cdn.shopify.com/s/files/1/0439/7744/1438/files/fiddling_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0436/0686/8126/files/aging_society_and_the_life_course.pdf
    • https://cdn.shopify.com/s/files/1/0434/1871/4277/files/ruvonivuzuwijofokowus.pdf
    • https://cdn.shopify.com/s/files/1/0434/3015/0300/files/43844444392.pdf
    • https://cdn.shopify.com/s/files/1/0431/0512/4503/files/69904922578.pdf
    • https://cdn.shopify.com/s/files/1/0441/2270/1976/files/denon_soundbar_dht-_t100_manual.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_off00006c7a.bin
6b2c77e7d30795b0297af5a55c4a4ec2ba3f20f8ef908ed012342172efd5982c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C7A 5556 bytes
font_01_sfnt_off00007f63.bin
977820683f7c47dcccf1942c682b700ca518306b27210f7f67e8ff4fd5804aa1
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F63 9796 bytes