Malicious PDF — malware analysis report

Static analysis result for SHA-256 644ddad4bb9c45ec…

MALICIOUS

PDF

65.1 KB Created: 2020-07-20 18:32:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ffd756e65841b5ed788a6b210091f1f8 SHA-1: bcf66662d6d005d998d206694cd8f750d8935bb4 SHA-256: 644ddad4bb9c45ec192a5f6fd76facfe2098eaaa77e3cd5b8e397595b221457c
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector, suggesting an attempt to lead users to harmful content. The document body, though heavily obfuscated, contains text related to 'free chinese children's books pdf', likely a lure. The presence of embedded URLs and the ML classifier's high confidence further support a malicious classification.

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=free+chinese+children%2527s+books+pdf
    • http://files.spamitzvah.com/uploads/1/3/1/3/131384789/2268709.pdf
    • http://files.tigerindustriesinc.com/uploads/1/3/1/3/131379991/5910297.pdf
    • http://files.shoptiga.com/uploads/1/3/1/4/131438468/5424454.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0428/3842/5767/files/92486208575.pdf
    • https://cdn.shopify.com/s/files/1/0432/6604/8165/files/99894910275.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rosetotirumeza.pdf
    • https://sobetolav.files.wordpress.com/2020/06/19629798821.pdf
    • https://worilivino.files.wordpress.com/2020/07/3476823530.pdf
    • https://tazesetinud.files.wordpress.com/2020/07/29585848583.pdf
    • https://limapifog.files.wordpress.com/2020/07/76688498975.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13908697451.pdf
    • https://cdn.shopify.com/s/files/1/0430/6026/5117/files/valevubemojobaparun.pdf
    • https://cdn.shopify.com/s/files/1/0431/3110/9538/files/33109642706.pdf
    • https://cdn.shopify.com/s/files/1/0432/9648/9632/files/75173077708.pdf
    • https://cdn.shopify.com/s/files/1/0434/7445/2632/files/zemawo.pdf
    • https://cdn.shopify.com/s/files/1/0435/9228/6363/files/mapofa.pdf
    • https://cdn.shopify.com/s/files/1/0434/2900/3416/files/kodofegajefovujerose.pdf
    • https://cdn.shopify.com/s/files/1/0431/8268/6367/files/71191671252.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007bd2.bin
d8755a2c408148c82a128e20696689539af267fbb32c868e6960205a38b0f4ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BD2 18068 bytes
font_01_sfnt_off0000b514.bin
64531fbdccde3bf60a367959e037a7cb8658781fb529fc4f369f2f2ea6a9a6a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB514 4936 bytes
font_02_sfnt_off0000c5c0.bin
1654bc0cda1159253134b03a36dddb20eac1462709afa1220871038ad901d162		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C0 11056 bytes
font_03_sfnt_off0000eb32.bin
11bf571f0af05367446b2020c2f1c6267491649bc48117454eca19867f219dc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB32 2752 bytes

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