Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebbfe804ce5d6e4c…

MALICIOUS

PDF

45.6 KB Created: 2020-08-18 21:30:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8c29e9986d4d6713ef16755e39b1ed1 SHA-1: 094b3b11fa7dad40012bcc820fdeda6ec04dd9de SHA-256: ebbfe804ce5d6e4c86b57be456d0dc5186c2822d15f4559cf04f0a5009cded8c
152 Risk Score

Malware Insights

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

The PDF document contains a malicious redirector link, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, appears to be a lure related to internship reports. The primary malicious IOC is the redirector URL, which likely leads to further malicious content or phishing pages. The ML classifier also strongly indicated maliciousness.

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=internship+report+pdf+for+computer+science+students
    • http://files.petergroynom.com/uploads/1/3/1/6/131606395/zipimodak.pdf
    • http://ziremijib.donnasdressshop.com/uploads/1/3/1/3/131379255/a45cdfb6141eaf.pdf
    • http://denenol.sunreyes.org/uploads/1/3/1/4/131408738/webipelotujavo.pdf
    • http://kitit.brisbanebirthing.com/uploads/1/3/0/8/130813030/wexumulug.pdf
    • https://cdn.shopify.com/s/files/1/0432/2482/6014/files/44151674202.pdf
    • https://cdn.shopify.com/s/files/1/0435/2756/9576/files/56553305325.pdf
    • https://cdn.shopify.com/s/files/1/0427/8370/3206/files/46211693332.pdf
    • https://cdn.shopify.com/s/files/1/0431/3432/0794/files/jomuvodokaxusujopef.pdf
    • https://cdn.shopify.com/s/files/1/0450/9289/6920/files/vurowabar.pdf
    • https://cdn.shopify.com/s/files/1/0435/8343/9003/files/materi_akuntansi_keuangan_lanjutan_1.pdf
    • https://cdn.shopify.com/s/files/1/0438/8877/1227/files/37205412868.pdf
    • https://cdn.shopify.com/s/files/1/0432/2738/1924/files/australian_sign_language_alphabet.pdf
    • https://cdn.shopify.com/s/files/1/0430/6275/5490/files/xesixatabe.pdf
    • https://cdn.shopify.com/s/files/1/0431/8098/2429/files/duwofidubekav.pdf
    • https://cdn.shopify.com/s/files/1/0438/2323/5234/files/allahabad_high_court_ro_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0428/4809/2323/files/galarikewugolezumorotawok.pdf
    • https://cdn.shopify.com/s/files/1/0433/5393/1944/files/mokewukaxisokifusi.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_off0000768a.bin
f5d88de80a1920682263d1f8cd0ed39f59030d44be24f710d49c4beaca642f23
pdf-font-stream PDF embedded font (sfnt) at offset 0x768A 5092 bytes
font_01_sfnt_off000087a9.bin
a4498737162d322fa4e109f656113295cc813869a8aa5b85e25cb707e57300f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x87A9 9712 bytes