Malicious PDF — malware analysis report

Static analysis result for SHA-256 82872c75dafdfa71…

MALICIOUS

PDF

40.5 KB Created: 2020-08-19 16:40:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2c8ed07aabf35780fe407116f7a797a SHA-1: c2df2f153cc9a1e738c62c9f8f8bc70d4530f56f SHA-256: 82872c75dafdfa716fa6d60a57d908b47d489c4a2b17c8e3e9322063ba30c28b
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also flagged this PDF with high confidence. The document body contains garbled text but also includes the URL https://ttraff.cc/pify?keyword=citra+for+android+github, which is a known malicious redirector. The presence of numerous links suggests a link farm or phishing attempt designed to lead users to malicious content.

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.cc/pify?keyword=citra+for+android+github
    • http://sarefi.mrjennings.org/uploads/1/3/0/7/130776457/92632b.pdf
    • http://zoliti.ameliaandcompany.com/uploads/1/3/0/8/130814017/fuvopax-witeru.pdf
    • http://files.harmonyorganics.net/uploads/1/3/1/3/131383771/59d2bca.pdf
    • http://kobat.shawnbersethmemorialfund.com/uploads/1/3/0/8/130814328/3f44ef51f4f72c.pdf
    • http://files.newbernapp.com/uploads/1/3/0/7/130739190/9c7a4ba5871.pdf
    • https://cdn.shopify.com/s/files/1/0435/6331/9445/files/star_spangled_banner_tab.pdf
    • https://cdn.shopify.com/s/files/1/0437/8735/4270/files/selenium_facebook_comment.pdf
    • https://cdn.shopify.com/s/files/1/0437/9725/0210/files/jewijenobazo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6214/0840/files/bling_launcher_no_ads_apk.pdf
    • https://cdn.shopify.com/s/files/1/0432/8253/0472/files/xiraninazif.pdf
    • https://cdn.shopify.com/s/files/1/0437/8837/0072/files/77113800491.pdf
    • https://cdn.shopify.com/s/files/1/0437/3531/8689/files/fuzozixopugoxazamu.pdf
    • https://cdn.shopify.com/s/files/1/0430/1075/2663/files/45929216110.pdf
    • https://cdn.shopify.com/s/files/1/0439/2170/3067/files/88682402571.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/82973104521.pdf
    • https://cdn.shopify.com/s/files/1/0437/5917/3784/files/la_invencin_de_morel_adolfo_bioy_casares.pdf
    • https://cdn.shopify.com/s/files/1/0428/8466/1414/files/somali_english_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0432/3645/8654/files/calabozos_y_dragones_juego_de_mesa.pdf
    • https://cdn.shopify.com/s/files/1/0435/4169/2570/files/6733731111.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000535c.bin
359fbcc9aaf27dbfe0358c1fe634da12e63dba4c9ae8cd155c032837426e0e6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x535C 4884 bytes
font_01_sfnt_off000063de.bin
ca0472239ad84ddf65939251edb2883061d9170bbf205ad637e8c271fc85ebf0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63DE 10160 bytes
font_02_sfnt_off0000869e.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x869E 4324 bytes

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