Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fbfb0695ebd71ee…

MALICIOUS

PDF

51.5 KB Created: 2020-08-20 12:28:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b875f7c17b599cfd85d5a05f5b2b3de2 SHA-1: 79803289e66d3be1c0adad9c54292537ce1db82c SHA-256: 8fbfb0695ebd71ee5b8f968941e6e89cabfebe84ae5bb6ee782bc08fbe4b98c8
128 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many of which are part of a link farm designed to appear as legitimate content. One critical heuristic indicates a malicious redirector link, and another identifies a link farm structure. The document body also contains a call-to-action phrase, suggesting a lure to click these links. The primary malicious IOC is the redirector URL, which likely serves as the initial stage for delivering further malicious payloads.

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.ru/pify?keyword=calligraphy+writing+templates
    • http://files.bombexnovelties.com/uploads/1/3/2/7/132740337/b7a286225d93f25.pdf
    • https://cdn.shopify.com/s/files/1/0431/4539/6384/files/punasisalevefavoge.pdf
    • https://cdn.shopify.com/s/files/1/0431/3920/3229/files/efftronics_written_test_papers_with_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0434/7022/5574/files/extra_wide_king_size_bed_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0430/9729/2949/files/bsc_1st_year_physics_mechanics_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/3105/1943/files/mafamuxoraw.pdf
    • https://cdn.shopify.com/s/files/1/0435/2075/3823/files/kannada_feeling_video_songs_mp4.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mojedisubeweful.pdf
    • https://cdn.shopify.com/s/files/1/0431/9127/1586/files/kuliveforajapobov.pdf
    • https://cdn.shopify.com/s/files/1/0429/2204/9695/files/98105851898.pdf
    • https://cdn.shopify.com/s/files/1/0428/2341/8019/files/kivagukex.pdf
    • https://cdn.shopify.com/s/files/1/0429/3797/4950/files/gumigeberobavasuvaxeja.pdf
    • https://cdn.shopify.com/s/files/1/0435/9300/7272/files/nanisuxumekejufiw.pdf
    • https://cdn.shopify.com/s/files/1/0428/0372/4455/files/penn_dot_bulletin_15.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068c4.bin
27d384bdfbcd319c1b1b3467d8f50b088b667d032c830af8fc6bc39dc1b870e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x68C4 5128 bytes
font_01_sfnt_off00007a13.bin
3a6ea68be99ae8f70908d1b039cc781739e2f950c79db50c1e6c1da0955f739e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A13 10364 bytes
font_02_sfnt_off00009dab.bin
d4c4feb8951055c2fa9bcdd55af7a36c85e906000362d0091f30ac23a55c13ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x9DAB 16192 bytes
font_03_sfnt_off0000b2e3.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E3 4324 bytes