Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5da17c5ebe3fcc0…

MALICIOUS

PDF

46.9 KB Created: 2020-08-28 23:42:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e26d99bdd4f43cf9875a5bb9ddcb80fa SHA-1: d08735ed154e151ee4a998ee9865d5fbc77fa1ac SHA-256: f5da17c5ebe3fcc031278b5dc7fdf9c1b506000acfc9d075c7e8ccb116f6f096
154 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it's a redirector link to known malicious infrastructure. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to external resources. The primary malicious URL identified is https://ttraff.com/wix?keyword=brasov+mapa+pdf, which is likely used to lure victims into a phishing or malware distribution scheme. The document body contains garbled text but includes the malicious URL.

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/wix?keyword=brasov+mapa+pdf
    • https://cdn.shopify.com/s/files/1/0430/7723/8945/files/92142847215.pdf
    • https://cdn.shopify.com/s/files/1/0430/7881/1797/files/danexixewadijeme.pdf
    • https://cdn.shopify.com/s/files/1/0437/7287/0807/files/tratado_de_agayu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6885/8280/files/65224966239.pdf
    • https://cdn.shopify.com/s/files/1/0434/3064/1826/files/42639211037.pdf
    • https://cdn.shopify.com/s/files/1/0439/2786/3464/files/2655214824.pdf
    • https://cdn.shopify.com/s/files/1/0435/5591/3879/files/bam_bam_song_mr_jatt.pdf
    • https://static.usrfiles.com/ugd/b8c837_d946a00d414141e79af84fb08e1ae5de.pdf
    • https://static.usrfiles.com/ugd/b8c837_9e6c73a0db134c0095ad4887dd126290.pdf
    • https://static.usrfiles.com/ugd/b8c837_99ea93d438a34e9a980688eeb3c53495.pdf
    • https://static.usrfiles.com/ugd/b8c837_1410f3e0148a46feb1339822ff8d32aa.pdf
    • https://cdn.shopify.com/s/files/1/0435/8150/5695/files/kigolitajevosozapubor.pdf
    • https://cdn.shopify.com/s/files/1/0432/5045/0600/files/nuxobafafosinabafota.pdf
    • https://cdn.shopify.com/s/files/1/0432/5680/7586/files/duvakalitaxujimaripadadek.pdf
    • https://cdn.shopify.com/s/files/1/0440/8960/6294/files/63579813291.pdf
    • https://cdn.shopify.com/s/files/1/0433/8846/9398/files/banamurigijofatek.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_off00006aa9.bin
96eb68dfe6621a65a5283593310797e636865a811f12b8b04d157c1043b8caf8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AA9 5264 bytes
font_01_sfnt_off00007c7f.bin
4dcdff5fb8f569557d8932ed2c443d22b34250cf11c90979ea807d4bec290e0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C7F 16352 bytes

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