Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5e643b4e9017098…

MALICIOUS

PDF

45.7 KB Created: 2020-08-12 16:47:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2673036098c1be4e4dce3430690f3aef SHA-1: e984cfd4eea27bee6c9651a209009e238d2ee31a SHA-256: d5e643b4e90170987d5e73f92f3bc83c4375bf05809f8229483bf15d46cf9871
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised as an educational resource. This indicates a likely attempt to lure users to malicious infrastructure. The PDF also exhibits characteristics of a link farm, with numerous embedded links to other PDFs, suggesting a broad distribution or SEO poisoning tactic. No scripts were extracted, but the presence of malicious links and the ML classifier's high confidence score strongly suggest a malicious intent.

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=evaluating+algebraic+expressions+worksheets+with+answers+pdf
    • http://files.estatenest.ca/uploads/1/3/2/6/132696351/vinolidulaferikawa.pdf
    • http://files.mshoeferstotallyawesomewebsite.com/uploads/1/3/1/4/131437924/b6e58c4d915.pdf
    • http://files.emilysullivansmith.com/uploads/1/3/1/3/131380688/3212d.pdf
    • https://cdn.shopify.com/s/files/1/0437/9541/5189/files/jifudiku.pdf
    • https://cdn.shopify.com/s/files/1/0446/6999/3123/files/pegipajakaxuneva.pdf
    • https://cdn.shopify.com/s/files/1/0433/4305/2953/files/8583972.pdf
    • https://cdn.shopify.com/s/files/1/0430/2041/9226/files/spatial_data_modelling_for_3d_gis.pdf
    • https://cdn.shopify.com/s/files/1/0430/3316/5986/files/kuxemolunagun.pdf
    • https://cdn.shopify.com/s/files/1/0435/3936/6047/files/smd_capacitor_code_chart.pdf
    • https://cdn.shopify.com/s/files/1/0434/0505/0021/files/manoforigolosomozazeb.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vofekofunore.pdf
    • https://cdn.shopify.com/s/files/1/0427/8288/4006/files/jovupopofafekazimogi.pdf
    • https://cdn.shopify.com/s/files/1/0430/6753/9623/files/lirituzamuzax.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_off000072d2.bin
595197481f149480ddf423eca7af61adbff5a21094ece0ffdb68dd8cefde8614
pdf-font-stream PDF embedded font (sfnt) at offset 0x72D2 5796 bytes
font_01_sfnt_off0000869f.bin
2c833e70e021538d52f965b14b8fbd1d05b72f19e21345eb18c8f0d8c8165f72
pdf-font-stream PDF embedded font (sfnt) at offset 0x869F 10264 bytes