Malicious PDF — malware analysis report

Static analysis result for SHA-256 c81b3840b0e361f2…

MALICIOUS

PDF

50.5 KB Created: 2020-08-24 02:40:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6b6dd45d79d824021a8db9681284b744 SHA-1: 25421ce02ef7e4b60e45dc302f164749899816df SHA-256: c81b3840b0e361f26e02d427516624b0f7942c5a99e4afdab87acc336865f9fe
128 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 an online exam form. This is further supported by heuristics indicating a malicious redirector and a link farm designed for SEO manipulation. The document body contains the primary malicious URL and numerous other links, likely intended to broaden the attack surface or appear legitimate. No scripts were extracted from this sample.

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=ccs+university+online+exam+form+bba
    • http://jezeva.oneloveskateboardshop.com/uploads/1/3/0/9/130969723/figiv.pdf
    • http://files.bluesparrowcreations.com/uploads/1/3/0/9/130969791/fepuxetawevode-gizifika.pdf
    • http://sebowut.sidewaysoul.com/uploads/1/3/0/7/130739197/b3df3c.pdf
    • http://files.atomicagevintage.com/uploads/1/3/0/9/130969211/minenodinujizu_lexusujiv.pdf
    • https://cdn.shopify.com/s/files/1/0428/2312/3100/files/batman_the_dark_knight_returns_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/3950/5056/files/logical_reasoning_aptitude_questions.pdf
    • https://cdn.shopify.com/s/files/1/0433/1926/3397/files/86177581707.pdf
    • https://cdn.shopify.com/s/files/1/0431/8468/5220/files/gibomajixeruxubib.pdf
    • https://cdn.shopify.com/s/files/1/0437/7994/8695/files/vegumowesuzenelidutet.pdf
    • https://cdn.shopify.com/s/files/1/0435/9946/2562/files/84226512732.pdf
    • https://cdn.shopify.com/s/files/1/0430/0469/0581/files/lobixilojoxaniduvajito.pdf
    • https://cdn.shopify.com/s/files/1/0438/4777/8469/files/buku_biologi_sma_kelas_12.pdf
    • https://cdn.shopify.com/s/files/1/0430/4224/2709/files/aurora_3d_animation_maker_templates_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/4814/7867/files/bluestacks_windows_10_32_bit.pdf
    • https://cdn.shopify.com/s/files/1/0431/0971/2033/files/mscomct2_ocx_windows_7.pdf
    • https://cdn.shopify.com/s/files/1/0431/6132/1634/files/95663568429.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
stream_007_off0000ac15.bin
c9772b2d952f6797d9fea9da83f0903ab1060aab688100452a7977688f3f9f78		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xAC15 4244 bytes
font_00_sfnt_off00006996.bin
9dbfe2a7ac2863b2652d7245cdf0ed4422e0be3ebc966cd1847464be1eb73f77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6996 5304 bytes
font_01_sfnt_off00007b91.bin
e24c97e63b5b6dbd8626672a8e7d2a8c1e311e0eb2af589681e939ebfbd1cf9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B91 10084 bytes
font_02_sfnt_off00009e14.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E14 4324 bytes

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