Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b5ed9a2b8573d2c…

MALICIOUS

PDF

42.7 KB Created: 2020-08-07 03:36:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9da7709bb58b2441638415f7805622a SHA-1: d7e072b6a7438878993286354f8f6c1165973473 SHA-256: 6b5ed9a2b8573d2c9f2a42c950c27cc868d8ef4985b30da0ac03e47c75975ae4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that matches the primary malicious redirector, suggesting the document's purpose is to drive traffic to malicious sites. No scripts were extracted, but the presence of many links indicates a link farm or phishing attempt.

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.cc/pify?keyword=reading+comprehension+worksheets+high+school+pdf
    • http://files.jorgegomezelizondo.com/uploads/1/3/1/8/131856392/rebaj_sifonunolosoxaf_bigorujixuzote_vimeximog.pdf
    • http://files.babesintoylanddaycare.com/uploads/1/3/0/7/130776208/f8bd23b7ea63e7.pdf
    • http://files.ogrowneyns.ie/uploads/1/3/0/9/130969080/zemusinereg.pdf
    • http://files.dumbingdownamerica.net/uploads/1/3/1/4/131407552/nupibu-nefusolo-mibajokaro.pdf
    • http://files.bambooble.com/uploads/1/3/0/8/130814611/faxowafun.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/7245/4810/files/unity_swipe_controls.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rikakaxudote.pdf
    • https://cdn.shopify.com/s/files/1/0429/9715/3943/files/basic_english_grammar_tutorial_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0447/9169/3463/files/dubai_expo_2020_master_plan.pdf
    • https://cdn.shopify.com/s/files/1/0429/7087/4009/files/kha_zix_probuilds.pdf
    • https://cdn.shopify.com/s/files/1/0435/7944/1307/files/84481599958.pdf
    • https://cdn.shopify.com/s/files/1/0430/8631/5671/files/69718555086.pdf
    • https://cdn.shopify.com/s/files/1/0435/6397/4805/files/47940812830.pdf
    • https://cdn.shopify.com/s/files/1/0433/8289/8840/files/raduvij.pdf
    • https://cdn.shopify.com/s/files/1/0436/0057/6669/files/time_wasted_on_league.pdf
    • https://cdn.shopify.com/s/files/1/0433/9977/4364/files/lidipirufomiruk.pdf
    • https://cdn.shopify.com/s/files/1/0430/4656/8098/files/wodilaxoweb.pdf
    • https://cdn.shopify.com/s/files/1/0432/2977/3982/files/55853884789.pdf
    • https://cdn.shopify.com/s/files/1/0435/0840/0280/files/encuentros_maravillosos.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006747.bin
f876e4139a73f3ee7570bade9250b9382bb38efaeb3672f86c30d9892cffa8eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6747 5732 bytes
font_01_sfnt_off00007abc.bin
5f8ea00d0451a0b26e847eb349c6bf850057255f609b8394555b67c02cace665		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7ABC 10132 bytes

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