Malicious PDF — malware analysis report

Static analysis result for SHA-256 de9a89703422366a…

MALICIOUS

PDF

45.9 KB Created: 2020-08-06 22:18:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33f5efe2181b840ffc746d89cfa2ec9d SHA-1: b631d80ac64967c837a9760ac5b5f0a8ec2e54d9 SHA-256: de9a89703422366aefd4da401d9930bafdee50cf49b781b0c0449848f3fe2660
152 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to a textbook download and the malicious URL. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be a lure to a redirector disguised as a legitimate file download.

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=udit+agarwal+algorithms+design+and+analysis+pdf+download
    • http://files.gowineusa.com/uploads/1/3/1/0/131070207/f1e1038.pdf
    • http://files.gabisorrentino.com/uploads/1/3/1/0/131069869/9553720.pdf
    • http://files.joeuscinski.com/uploads/1/3/1/4/131453021/radafowogaluw_newonifoxeworep.pdf
    • http://files.cheytalks.com/uploads/1/3/1/1/131164124/7591160.pdf
    • http://files.soulandsynergyec.com/uploads/1/3/0/9/130969509/fakokodav.pdf
    • https://cdn.shopify.com/s/files/1/0432/4022/6984/files/vabajimazazapotuteniz.pdf
    • https://cdn.shopify.com/s/files/1/0431/9353/2573/files/galunapenel.pdf
    • https://cdn.shopify.com/s/files/1/0436/2344/8736/files/besitezorak.pdf
    • https://cdn.shopify.com/s/files/1/0428/2449/9367/files/93936966670.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xoxolesusoziviro.pdf
    • https://cdn.shopify.com/s/files/1/0430/0672/2211/files/74042308383.pdf
    • https://cdn.shopify.com/s/files/1/0428/1679/8883/files/joguxadivipo.pdf
    • https://cdn.shopify.com/s/files/1/0432/4445/4051/files/9480651515.pdf
    • https://cdn.shopify.com/s/files/1/0432/2898/7547/files/54287937193.pdf
    • https://cdn.shopify.com/s/files/1/0429/9948/0473/files/60383468977.pdf
    • https://cdn.shopify.com/s/files/1/0434/0455/8488/files/is_fontsgeek_safe.pdf
    • https://cdn.shopify.com/s/files/1/0430/2703/8359/files/fipazelez.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066ee.bin
c20acd498a2f9b353dce758bc802128ceb53439f6e2583ef95795c52752b51c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66EE 5428 bytes
font_01_sfnt_off00007956.bin
f2cdb2856efc074f5605577243e1a4166f4fbcad1f30cffeefa98db5ddf3c604		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7956 10236 bytes
font_02_sfnt_off00009c66.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C66 4324 bytes

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