Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcb392642c5297c0…

MALICIOUS

PDF

46.5 KB Created: 2020-08-16 02:23:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: febbc39781973e7469a885f23e72e110 SHA-1: cdf59617e9c18855ef98e9084529c742ffc07665 SHA-256: fcb392642c5297c098910ee7a1e3c6fa60a95ef7b1a32b5328ba39b34e9df1e4
120 Risk Score

Malware Insights

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

The PDF contains a prominent link that redirects to a malicious URL, disguised as a download for 'sickle cell anemia pdf'. This is further supported by heuristics indicating a malicious redirector link and a PDF link farm. The document body itself contains the malicious URL and appears to be generated by wkhtmltopdf, suggesting a programmatic approach to creating lure documents.

Heuristics 3

  • 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.
  • 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/wb?keyword=sickle%20cell%20anemia%20pdf%20download
    • http://files.graingercountytomatofestival.com/uploads/1/3/1/4/131452922/4702763.pdf
    • http://files.artlessons4u.com/uploads/1/3/0/9/130969146/moxogopigazefaf.pdf
    • http://vugerazi.objectivereader.com/uploads/1/3/1/6/131637240/xinajamakalomuk_mofeb_nalisa.pdf
    • https://cdn.shopify.com/s/files/1/0431/6450/0122/files/fewenu.pdf
    • https://cdn.shopify.com/s/files/1/0437/9069/6597/files/minecraft_pe_skyblock_server.pdf
    • https://cdn.shopify.com/s/files/1/0430/2949/5959/files/wudugobizurexom.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rejukimuvili.pdf
    • https://cdn.shopify.com/s/files/1/0430/4555/2290/files/dibanixivikakovizep.pdf
    • https://cdn.shopify.com/s/files/1/0431/7541/1872/files/brisbane_map.pdf
    • https://cdn.shopify.com/s/files/1/0434/0459/1271/files/lebejulewidegizuxuzu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8846/1478/files/writing_sample_for_graduate_school_application.pdf
    • https://cdn.shopify.com/s/files/1/0448/0391/5933/files/bowuxamakiwazabobanexal.pdf
    • https://cdn.shopify.com/s/files/1/0427/7446/2631/files/recurrent_calcium_oxalate_stone_formation.pdf
    • https://cdn.shopify.com/s/files/1/0435/1583/8618/files/sadidigajokotanuke.pdf
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/93324823759.pdf
    • https://cdn.shopify.com/s/files/1/0439/6757/8270/files/worksheet_arithmetic_and_geometric_sequences.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_off0000630b.bin
841813a996dd0a07cf165577e065b0bb4065df3bc9efc18dafbf8845718c257f
pdf-font-stream PDF embedded font (sfnt) at offset 0x630B 5284 bytes
font_01_sfnt_off00007502.bin
4db46a7fc6b5a22c00cddd0a9e9d97d4e3f555e92541d527687c7bd491cb714d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7502 10032 bytes
font_02_sfnt_off0000979d.bin
e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15
pdf-font-stream PDF embedded font (sfnt) at offset 0x979D 16204 bytes