Malicious PDF — malware analysis report

Static analysis result for SHA-256 a017a943b167db11…

MALICIOUS

PDF

38.8 KB Created: 2020-08-06 10:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e041ee50a4b5dc0a246832ad43a74b82 SHA-1: 66d535740210dcefcd862da3d42e71735c213bb5 SHA-256: a017a943b167db117e486675a44c0c375f5185b07e543d9015361531e9db6964
130 Risk Score

Malware Insights

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

The PDF contains a link disguised as 'exercises present simple questions pdf' which redirects to a malicious URL. The PDF also exhibits characteristics of a link farm, with numerous embedded links pointing to various domains, some of which are unknown. The presence of a visual download button further supports a social engineering lure. No scripts were extracted, but the primary attack vector appears to be a malicious redirector.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=exercises+present+simple+questions+pdf
    • http://tekuwu.richardmongiat.com/uploads/1/3/1/8/131871390/ac9c2f.pdf
    • http://files.moonlightlake.com/uploads/1/3/1/0/131071043/7f9451e99.pdf
    • http://files.nccsdonline.org/uploads/1/3/0/7/130775649/simerim.pdf
    • http://vakatako.brandywinevalleyquilters.org/uploads/1/3/1/4/131482995/e7f15fa.pdf
    • https://cdn.shopify.com/s/files/1/0449/6100/5736/files/etiology_of_gestational_diabetes_mellitus.pdf
    • https://cdn.shopify.com/s/files/1/0429/3692/6374/files/81758660474.pdf
    • https://cdn.shopify.com/s/files/1/0437/4737/7301/files/21104429733.pdf
    • https://cdn.shopify.com/s/files/1/0434/6803/0102/files/html_input_type_file_accept_only.pdf
    • https://cdn.shopify.com/s/files/1/0428/7610/8956/files/63666423492.pdf
    • https://cdn.shopify.com/s/files/1/0433/9869/3013/files/billy_goats_gruff_book.pdf
    • https://cdn.shopify.com/s/files/1/0429/4865/7311/files/uk_ancestry_visa_form.pdf
    • https://cdn.shopify.com/s/files/1/0434/0203/5351/files/42196979780.pdf
    • https://cdn.shopify.com/s/files/1/0430/4565/0586/files/rizulitedifil.pdf
    • https://cdn.shopify.com/s/files/1/0433/8827/2807/files/gifozurufafo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9492/4700/files/auto_combustion_synthesis.pdf
    • https://cdn.shopify.com/s/files/1/0430/8379/2548/files/dewan.pdf
    • https://cdn.shopify.com/s/files/1/0440/2737/9877/files/alleluia_alleluia_hymn_to_joy.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_off00005990.bin
e4547c4939efe4c326dd1fcfc8de89b71d5673ca4a8d59fd849daba14b886367
pdf-font-stream PDF embedded font (sfnt) at offset 0x5990 5244 bytes
font_01_sfnt_off00006b5a.bin
a51c055d56d5ff571f6f207036242e7cfaa81884226e3372634345d3555e97d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B5A 10232 bytes