Malicious PDF — malware analysis report

Static analysis result for SHA-256 77588f7db88e5827…

MALICIOUS

PDF

58.2 KB Created: 2020-07-31 04:46:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26a5a2e8dc55f67fbf0b9214acd707c2 SHA-1: b124f3e9bb0a7fe67a2e00bd577306522af3ccc0 SHA-256: 77588f7db88e5827cd3e5d149b334d1069dd30d3b1fb39994b5e00c41cbc7754
154 Risk Score

Malware Insights

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

The PDF file contains a link that redirects to a known malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, appears to be a lure for downloading academic materials, indicated by the presence of "Ba 1st year english literature books pdf download". The PDF_SEO_LINK_FARM heuristic suggests the document is part of a larger link farm designed for SEO manipulation, likely to drive traffic to malicious sites. No scripts were extracted from this sample.

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.ru/pify?keyword=ba+1st+year+english+literature+books+pdf+download
    • http://files.tomboulian.org/uploads/1/3/0/7/130739557/mifodajekagil.pdf
    • http://files.onewesterra.com/uploads/1/3/0/8/130874180/3352096.pdf
    • http://files.susannaloewy.org/uploads/1/3/2/6/132680853/jozaw_gijagake_xogos_wosav.pdf
    • http://files.excelerationstudios.com/uploads/1/3/1/4/131484029/jafipakasopivun.pdf
    • http://files.susannaloewy.org/uploads/1/3/2/6/132680853/jozaw
    • https://cdn.shopify.com/s/files/1/0430/2422/0321/files/votuwofebefadopidi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/77363931764.pdf
    • https://cdn.shopify.com/s/files/1/0431/4539/6386/files/mawiji.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2086/files/lobikamavono.pdf
    • https://cdn.shopify.com/s/files/1/0430/6717/9162/files/5016288421.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/fizibejomilefebesiveboti.pdf
    • https://cdn.shopify.com/s/files/1/0431/4795/2292/files/17226651835.pdf
    • https://cdn.shopify.com/s/files/1/0432/5956/0094/files/nudowufafow.pdf
    • https://cdn.shopify.com/s/files/1/0432/2587/4600/files/velovez.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/16485275060.pdf
    • https://cdn.shopify.com/s/files/1/0435/4582/1338/files/73913393460.pdf
    • https://cdn.shopify.com/s/files/1/0430/5967/5293/files/15427634998.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000779e.bin
f0fedeac0454a4a8800c4377b765641c07a569a760e4f37c35c7780be3c1dbd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x779E 5684 bytes
font_01_sfnt_off00008afa.bin
0356b696b297760848c49c968d58d5f134dcfb69e9a974516ab76476752695d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AFA 2596 bytes
font_02_sfnt_off0000967d.bin
7bb91423d63eb6bd7c2657278979848d60b7d38679106ec23dbd755ba6ab3d32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x967D 2320 bytes
font_03_sfnt_off0000a0cd.bin
a47797184c49c9f215c6e900c2156268c46c2db118f3441b69cdfe2f3b8e350d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA0CD 10560 bytes
font_04_sfnt_off0000c485.bin
4362e686776cae9b5e877a8e5de4a1ff5ae9966626bcf1046762b8e3a01bbea2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC485 16224 bytes

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